{"id":754,"date":"2024-11-15T15:19:03","date_gmt":"2024-11-15T06:19:03","guid":{"rendered":"https:\/\/dexall.co.jp\/articles\/?p=754"},"modified":"2025-03-24T08:52:53","modified_gmt":"2025-03-23T23:52:53","slug":"%e3%80%90java%e5%85%a5%e9%96%80%e3%80%91%e6%96%87%e5%ad%97%e5%88%97%e7%bd%ae%e6%8f%9b%e3%81%ae%e6%b1%ba%e5%ae%9a%e7%89%88%ef%bc%817%e3%81%a4%e3%81%ae%e5%ae%9f%e8%b7%b5%e7%9a%84%e3%81%aa%e7%bd%ae","status":"publish","type":"post","link":"https:\/\/dexall.co.jp\/articles\/?p=754","title":{"rendered":"\u3010Java\u5165\u9580\u3011\u6587\u5b57\u5217\u7f6e\u63db\u306e\u6c7a\u5b9a\u7248\uff017\u3064\u306e\u5b9f\u8df5\u7684\u306a\u7f6e\u63db\u624b\u6cd5\u3068\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9"},"content":{"rendered":"<div id=\"sgb-css-id-1\">\n<div class=\"toc\"><br \/>\n<b>Warning<\/b>:  Undefined array key \"is_admin\" in <b>\/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/sango-theme\/library\/gutenberg\/dist\/classes\/Toc.php<\/b> on line <b>116<\/b><br \/>\n<br \/>\n<b>Warning<\/b>:  Undefined array key \"is_category_top\" in <b>\/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/sango-theme\/library\/gutenberg\/dist\/classes\/Toc.php<\/b> on line <b>121<\/b><br \/>\n<br \/>\n<b>Warning<\/b>:  Undefined array key \"is_top\" in <b>\/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/sango-theme\/library\/gutenberg\/dist\/classes\/Toc.php<\/b> on line <b>128<\/b><br \/>\n    <div id=\"toc_container\" class=\"sgb-toc--bullets js-smooth-scroll\" data-dialog-title=\"\u76ee\u6b21\">\n      <p class=\"toc_title\">\u76ee\u6b21 <\/p>\n      <ul class=\"toc_list\">  <li class=\"first\">    <a href=\"#block-c411d191-2ea5-4882-bdbd-fc0fd1398a69\">\u306f\u3058\u3081\u306b<\/a>  <\/li>  <li>    <a href=\"#i-1\">\uff11\uff0eJava\u3067\u306e\u6587\u5b57\u5217\u7f6e\u63db\u306e\u57fa\u790e\u77e5\u8b58<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-2\">1.1 String.replace\u3068String.replaceAll\u306e\u9055\u3044\u3092\u7406\u89e3\u3057\u3088\u3046<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-5\">1.2 \u6b63\u898f\u8868\u73fe\u3092\u4f7f\u7528\u3057\u305f\u7f6e\u63db\u306e\u57fa\u672c<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-8\">\uff12\uff0e\u5b9f\u8df5\u3067\u4f7f\u3048\u308b7\u3064\u306e\u6587\u5b57\u5217\u7f6e\u63db\u30c6\u30af\u30cb\u30c3\u30af<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-9\">2.1 \u5358\u7d14\u306a\u6587\u5b57\u5217\u7f6e\u63db\uff1areplace\u30e1\u30bd\u30c3\u30c9\u306e\u6d3b\u7528\u6cd5<\/a>      <\/li>      <li>        <a href=\"#i-10\">2.2 \u8907\u6570\u7b87\u6240\u306e\u4e00\u62ec\u7f6e\u63db\uff1areplaceAll\u306e\u52b9\u7387\u7684\u306a\u4f7f\u3044\u65b9<\/a>      <\/li>      <li>        <a href=\"#i-11\">2.3 \u5927\u6587\u5b57\u5c0f\u6587\u5b57\u3092\u533a\u5225\u3057\u306a\u3044\u7f6e\u63db\u51e6\u7406\u306e\u5b9f\u88c5<\/a>      <\/li>      <li>        <a href=\"#i-12\">2.4 \u6b63\u898f\u8868\u73fe\u3092\u4f7f\u7528\u3057\u305f\u9ad8\u5ea6\u306a\u7f6e\u63db\u51e6\u7406<\/a>      <\/li>      <li>        <a href=\"#i-13\">2.5 StringBuilder\/StringBuffer\u3092\u4f7f\u7528\u3057\u305f\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316<\/a>      <\/li>      <li>        <a href=\"#i-14\">2.6 \u7279\u6b8a\u6587\u5b57\u306e\u7f6e\u63db\u306b\u304a\u3051\u308b\u30a8\u30b9\u30b1\u30fc\u30d7\u51e6\u7406<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-15\">2.7 \u6587\u5b57\u5217\u7f6e\u63db\u306e\u9023\u9396\u51e6\u7406\u30c6\u30af\u30cb\u30c3\u30af<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-16\">\uff13\uff0e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3068\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-17\">3.1 \u30e1\u30e2\u30ea\u52b9\u7387\u3092\u8003\u616e\u3057\u305f\u6587\u5b57\u5217\u7f6e\u63db\u306e\u5b9f\u88c5\u65b9\u6cd5<\/a>      <\/li>      <li>        <a href=\"#i-19\">3.2 \u5927\u91cf\u30c7\u30fc\u30bf\u51e6\u7406\u6642\u306e\u6700\u9069\u5316\u30c6\u30af\u30cb\u30c3\u30af<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-20\">3.3 \u6587\u5b57\u5217\u7f6e\u63db\u51e6\u7406\u306e\u30e6\u30cb\u30c3\u30c8\u30c6\u30b9\u30c8\u4f5c\u6210\u65b9\u6cd5<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-21\">\uff14\uff0e\u3088\u304f\u3042\u308b\u30a8\u30e9\u30fc\u3068\u5bfe\u51e6\u6cd5<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-22\">4.1 NullPointerException\u3092\u9632\u3050\u5b89\u5168\u306a\u5b9f\u88c5<\/a>      <\/li>      <li>        <a href=\"#i-23\">4.2 \u6b63\u898f\u8868\u73fe\u306e\u30d1\u30bf\u30fc\u30f3\u30de\u30c3\u30c1\u30f3\u30b0\u5931\u6557\u3078\u306e\u5bfe\u5fdc<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-24\">4.3 \u6587\u5b57\u30a8\u30f3\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u306b\u95a2\u3059\u308b\u554f\u984c\u306e\u89e3\u6c7a\u65b9\u6cd5<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-25\">\uff15\uff0e\u5b9f\u8df5\u7684\u306a\u30e6\u30fc\u30b9\u30b1\u30fc\u30b9\u96c6<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-26\">5.1 CSV\u30d5\u30a1\u30a4\u30eb\u51e6\u7406\u3067\u306e\u6587\u5b57\u5217\u7f6e\u63db\u6d3b\u7528\u4f8b<\/a>      <\/li>      <li>        <a href=\"#i-27\">5.2 \u30ed\u30b0\u51e6\u7406\u306b\u304a\u3051\u308b\u6a5f\u5bc6\u60c5\u5831\u306e\u7f6e\u63db\u30c6\u30af\u30cb\u30c3\u30af<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-28\">5.3 Web API\u30ec\u30b9\u30dd\u30f3\u30b9\u306e\u6587\u5b57\u5217\u52a0\u5de5\u5b9f\u88c5\u4f8b<\/a>      <\/li>    <\/ul>  <\/li>  <li class=\"last\">    <a href=\"#i-29\">\u307e\u3068\u3081\uff1a\u52b9\u679c\u7684\u306a\u6587\u5b57\u5217\u7f6e\u63db\u306e\u5b9f\u88c5\u306b\u5411\u3051\u3066<\/a>  <\/li><\/ul>\n      <a href=\"#\" class=\"sgb-toc-button js-toc-button\" rel=\"nofollow\" data-open-dialog=\"true\"><i class=\"fa fa-list\"><\/i><span class=\"sgb-toc-button__text\">\u76ee\u6b21\u3078<\/span><\/a>\n    <\/div><\/div><h2 class=\"wp-block-heading\" id=\"block-c411d191-2ea5-4882-bdbd-fc0fd1398a69\">\u306f\u3058\u3081\u306b<\/h2>\n<\/div>\n\n<div id=\"sgb-css-id-2\">\n<p class=\"wp-block-paragraph\" id=\"block-2d51ae2b-0190-4d3a-bc15-bf9e8be35ddb\">Java\u3067\u306e\u6587\u5b57\u5217\u64cd\u4f5c\u306f\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u958b\u767a\u306b\u304a\u3044\u3066\u6700\u3082\u983b\u7e41\u306b\u884c\u308f\u308c\u308b\u51e6\u7406\u306e\u4e00\u3064\u3067\u3059\u3002\u7279\u306b\u6587\u5b57\u5217\u7f6e\u63db\u306f\u3001\u30c7\u30fc\u30bf\u306e\u6574\u5f62\u3084\u30d0\u30ea\u30c7\u30fc\u30b7\u30e7\u30f3\u3001\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u5bfe\u7b56\u306a\u3069\u3001\u69d8\u3005\u306a\u5834\u9762\u3067\u5fc5\u8981\u3068\u306a\u308b\u91cd\u8981\u306a\u64cd\u4f5c\u3067\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-3\">\n<p class=\"wp-block-paragraph\" id=\"block-2cc2351f-f891-41d9-9a98-56b2671c91ca\">\u672c\u8a18\u4e8b\u3067\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u5185\u5bb9\u3092\u8a73\u3057\u304f\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-7\">\n<div class=\"wp-block-sgb-block-simple sgb-box-simple sgb-box-simple--title-normal sgb-box-simple--with-border\"><div style=\"background-color:var(--wp--preset--color--sango-main);color:#FFF\" class=\"sgb-box-simple__title\">\u672c\u8a18\u4e8b\u3067\u5b66\u3079\u308b\u3053\u3068<\/div><div class=\"sgb-box-simple__body\" style=\"border-color:var(--wp--preset--color--sango-main);background-color:#FFF\">\n<ul id=\"block-a43bd4c0-9455-4405-a68c-a614cdcd3c8f\" class=\"wp-block-list\"><div id=\"sgb-css-id-4\">\n<li>\u57fa\u672c\u7684\u306a\u6587\u5b57\u5217\u7f6e\u63db\u30e1\u30bd\u30c3\u30c9\u306e\u4f7f\u3044\u5206\u3051<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-5\">\n<li>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u8003\u616e\u3057\u305f\u5b9f\u88c5\u65b9\u6cd5<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-6\">\n<li>\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u3092\u78ba\u4fdd\u3057\u305f\u7f6e\u63db\u51e6\u7406<\/li>\n<\/div>\n\n\n<li>\u5b9f\u52d9\u3067\u4f7f\u3048\u308b\u5177\u4f53\u7684\u306a\u30e6\u30fc\u30b9\u30b1\u30fc\u30b9<\/li>\n<\/ul>\n<\/div><\/div>\n<\/div>\n\n<div id=\"sgb-css-id-8\">\n<p class=\"wp-block-paragraph\" id=\"block-2cc2351f-f891-41d9-9a98-56b2671c91ca\">\u305d\u308c\u3067\u306f\u3001Java\u3067\u306e\u6587\u5b57\u5217\u7f6e\u63db\u306b\u3064\u3044\u3066\u3001\u57fa\u790e\u304b\u3089\u5b9f\u8df5\u7684\u306a\u30c6\u30af\u30cb\u30c3\u30af\u307e\u3067\u3001\u6bb5\u968e\u7684\u306b\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-9\">\n<h2 class=\"wp-block-heading\" id=\"i-1\">\uff11\uff0eJava\u3067\u306e\u6587\u5b57\u5217\u7f6e\u63db\u306e\u57fa\u790e\u77e5\u8b58<\/h2>\n<\/div>\n\n<div id=\"sgb-css-id-10\">\n<p class=\"wp-block-paragraph\">Java\u3067\u306e\u6587\u5b57\u5217\u7f6e\u63db\u306f\u3001\u30c6\u30ad\u30b9\u30c8\u51e6\u7406\u306e\u57fa\u672c\u7684\u304b\u3064\u91cd\u8981\u306a\u64cd\u4f5c\u306e\u4e00\u3064\u3067\u3059\u3002\u3053\u306e\u7ae0\u3067\u306f\u3001\u57fa\u672c\u7684\u306a\u7f6e\u63db\u65b9\u6cd5\u304b\u3089\u3001\u3088\u308a\u9ad8\u5ea6\u306a\u4f7f\u3044\u65b9\u307e\u3067\u3001\u5b9f\u8df5\u7684\u306a\u4f8b\u3092\u4ea4\u3048\u3066\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-11\">\n<h3 class=\"wp-block-heading\" id=\"i-2\">1.1 String.replace\u3068String.replaceAll\u306e\u9055\u3044\u3092\u7406\u89e3\u3057\u3088\u3046<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-12\">\n<p class=\"wp-block-paragraph\"><code>String<\/code>\u30af\u30e9\u30b9\u306b\u306f\u3001\u6587\u5b57\u5217\u7f6e\u63db\u306e\u305f\u3081\u306e\u4e3b\u8981\u306a2\u3064\u306e\u30e1\u30bd\u30c3\u30c9\u304c\u3042\u308a\u307e\u3059\u3002<code>replace()<\/code>\u3068<code>replaceAll()<\/code>\u3067\u3059\u3002\u3053\u308c\u3089\u306f\u4e00\u898b\u4f3c\u3066\u3044\u307e\u3059\u304c\u3001\u91cd\u8981\u306a\u9055\u3044\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-13\">\n<h4 class=\"wp-block-heading\" id=\"i-3\">replace()\u30e1\u30bd\u30c3\u30c9<\/h4>\n<\/div>\n\n<div id=\"sgb-css-id-14\">\n<p class=\"wp-block-paragraph\"><code>replace()<\/code>\u30e1\u30bd\u30c3\u30c9\u306b\u306f2\u3064\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u6587\u5b57\uff08char\uff09\u306e\u7f6e\u63db\npublic String replace(char oldChar, char newChar)\n\/\/ \u6587\u5b57\u5217\uff08String\uff09\u306e\u7f6e\u63db\npublic String replace(CharSequence target, CharSequence replacement)<\/pre>\n\n\n<div id=\"sgb-css-id-15\">\n<p class=\"wp-block-paragraph\">\u4f7f\u7528\u4f8b\uff1a<\/p>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">String text = \"Hello World\";\n\/\/ \u6587\u5b57\u306e\u7f6e\u63db\nString result1 = text.replace('l', 'L');  \/\/ \"HeLLo WorLd\"\n\/\/ \u6587\u5b57\u5217\u306e\u7f6e\u63db\nString result2 = text.replace(\"World\", \"Java\");  \/\/ \"Hello Java\"<\/pre>\n\n\n<div id=\"sgb-css-id-16\">\n<h4 class=\"wp-block-heading\" id=\"i-4\">replaceAll()\u30e1\u30bd\u30c3\u30c9<\/h4>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public String replaceAll(String regex, String replacement)<\/pre>\n\n\n<div id=\"sgb-css-id-17\">\n<p class=\"wp-block-paragraph\"><code>replaceAll()<\/code>\u306f\u6b63\u898f\u8868\u73fe\u3092\u4f7f\u7528\u3057\u305f\u7f6e\u63db\u304c\u53ef\u80fd\u3067\u3059\u3002<\/p>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">String text = \"Hello123World456\";\n\/\/ \u6570\u5b57\u3092\u5168\u3066'X'\u306b\u7f6e\u63db\nString result = text.replaceFirst(\"\\\\d+\", \"X\");  \/\/ \"HelloXWorld456\"<\/pre>\n\n\n<div id=\"sgb-css-id-18\">\n<p class=\"wp-block-paragraph\"><strong>\u4e3b\u306a\u9055\u3044\u306e\u6bd4\u8f03\uff1a<\/strong><\/p>\n<\/div>\n\n<div id=\"id-47e174b5-109d-47fa-bd99-1244dc72115f\"><div id=\"sgb-css-id-19\">\n<figure class=\"wp-block-table\"><table><thead><tr><th>\u6a5f\u80fd<\/th><th>replace()<\/th><th>replaceAll()<\/th><\/tr><\/thead><tbody><tr><td>\u6b63\u898f\u8868\u73fe\u5bfe\u5fdc<\/td><td>\u00d7<\/td><td>\u25cb<\/td><\/tr><tr><td>\u30ea\u30c6\u30e9\u30eb\u6587\u5b57\u5217\u7f6e\u63db<\/td><td>\u25cb<\/td><td>\u25cb<\/td><\/tr><tr><td>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9<\/td><td>\u9ad8\u901f<\/td><td>\u6b63\u898f\u8868\u73fe\u51e6\u7406\u304c\u5fc5\u8981\u306a\u305f\u3081\u6bd4\u8f03\u7684\u9045\u3044<\/td><\/tr><tr><td>\u4f7f\u7528\u30b7\u30fc\u30f3<\/td><td>\u5358\u7d14\u306a\u7f6e\u63db<\/td><td>\u30d1\u30bf\u30fc\u30f3\u30de\u30c3\u30c1\u30f3\u30b0\u304c\u5fc5\u8981\u306a\u7f6e\u63db<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div><\/div>\n\n<div id=\"sgb-css-id-20\">\n<h3 class=\"wp-block-heading\" id=\"i-5\">1.2 \u6b63\u898f\u8868\u73fe\u3092\u4f7f\u7528\u3057\u305f\u7f6e\u63db\u306e\u57fa\u672c<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-21\">\n<p class=\"wp-block-paragraph\">\u6b63\u898f\u8868\u73fe\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u3088\u308a\u67d4\u8edf\u306a\u6587\u5b57\u5217\u7f6e\u63db\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u3002\u4ee5\u4e0b\u306b\u4e3b\u8981\u306a\u6b63\u898f\u8868\u73fe\u30d1\u30bf\u30fc\u30f3\u3068\u4f7f\u7528\u4f8b\u3092\u793a\u3057\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-22\">\n<h4 class=\"wp-block-heading\" id=\"i-6\">\u57fa\u672c\u7684\u306a\u6b63\u898f\u8868\u73fe\u30d1\u30bf\u30fc\u30f3<\/h4>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">String text = \"User123 has 456 points\";\n\n\/\/ \u6570\u5b57\u306e\u7f6e\u63db\nString result1 = text.replaceAll(\"\\\\d+\", \"XXX\");\nSystem.out.println(result1);  \/\/ \"UserXXX has XXX points\"\n\n\/\/ \u7a7a\u767d\u6587\u5b57\u306e\u7f6e\u63db\nString result2 = text.replaceAll(\"\\\\s+\", \"_\");\nSystem.out.println(result2);  \/\/ \"User123_has_456_points\"\n\n\/\/ \u6587\u5b57\u5217\u306e\u5148\u982d\u3068\u672b\u5c3e\u306e\u30de\u30c3\u30c1\u30f3\u30b0\nString result3 = text.replaceAll(\"^User\", \"Player\");\nSystem.out.println(result3);  \/\/ \"Player123 has 456 points\"<\/pre>\n\n\n<div id=\"sgb-css-id-23\">\n<h4 class=\"wp-block-heading\" id=\"i-7\">\u3088\u304f\u4f7f\u7528\u3059\u308b\u6b63\u898f\u8868\u73fe\u30d1\u30bf\u30fc\u30f3\u4e00\u89a7<\/h4>\n<\/div>\n\n<div id=\"id-760d7d43-6636-4317-8f51-54d72054538b\"><div id=\"sgb-css-id-24\">\n<figure class=\"wp-block-table\"><table><thead><tr><th>\u30d1\u30bf\u30fc\u30f3<\/th><th>\u8aac\u660e<\/th><th>\u4f8b<\/th><\/tr><\/thead><tbody><tr><td><code>\\\\d<\/code><\/td><td>\u4efb\u610f\u306e\u6570\u5b57<\/td><td>\u201cabc123\u201d \u2192 \u201cabcXXX\u201d<\/td><\/tr><tr><td><code>\\\\s<\/code><\/td><td>\u7a7a\u767d\u6587\u5b57<\/td><td>\u201ca b c\u201d \u2192 \u201ca_b_c\u201d<\/td><\/tr><tr><td><code>\\\\w<\/code><\/td><td>\u5358\u8a9e\u6587\u5b57<\/td><td>\u201cHello!\u201d \u2192 \u201cXXXXX!\u201d<\/td><\/tr><tr><td><code>^<\/code><\/td><td>\u884c\u306e\u5148\u982d<\/td><td>\u201c^Hello\u201d \u3067\u5148\u982d\u306eHello\u306e\u307f\u30de\u30c3\u30c1<\/td><\/tr><tr><td><code>$<\/code><\/td><td>\u884c\u306e\u672b\u5c3e<\/td><td>\u201cend$\u201d \u3067\u672b\u5c3e\u306eend\u306e\u307f\u30de\u30c3\u30c1<\/td><\/tr><tr><td><code>.*<\/code><\/td><td>\u4efb\u610f\u306e\u6587\u5b57\u5217<\/td><td>\u201ca.*c\u201d \u3067 \u201cabc\u201d, \u201cac\u201d, \u201cabbc\u201d \u306a\u3069\u306b\u30de\u30c3\u30c1<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div><\/div>\n\n<div id=\"sgb-css-id-25\">\n<p class=\"wp-block-paragraph\"><strong>\u5b9f\u8df5\u7684\u306a\u4f7f\u7528\u4f8b\uff1a<\/strong><\/p>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u30e1\u30fc\u30eb\u30a2\u30c9\u30ec\u30b9\u306e\u30c9\u30e1\u30a4\u30f3\u90e8\u5206\u3092\u7f6e\u63db\nString email = \"user@example.com\";\nString masked = email.replaceAll(\"@.*$\", \"@masked.com\");\nSystem.out.println(masked);  \/\/ \"user@masked.com\"\n\n\/\/ \u96fb\u8a71\u756a\u53f7\u306e\u4e00\u90e8\u3092\u30de\u30b9\u30af\nString phone = \"090-1234-5678\";\nString maskedPhone = phone.replaceAll(\"\\\\d(?=\\\\d{4})\", \"*\");\nSystem.out.println(maskedPhone);  \/\/ \"090-****-5678\"<\/pre>\n\n\n<div id=\"sgb-css-id-26\">\n<p class=\"wp-block-paragraph\">\u3053\u308c\u3089\u306e\u57fa\u672c\u3092\u7406\u89e3\u3059\u308b\u3053\u3068\u3067\u3001\u3088\u308a\u8907\u96d1\u306a\u6587\u5b57\u5217\u7f6e\u63db\u51e6\u7406\u3082\u5b9f\u88c5\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002\u6b21\u7ae0\u3067\u306f\u3001\u3053\u308c\u3089\u306e\u57fa\u672c\u77e5\u8b58\u3092\u6d3b\u7528\u3057\u305f\u5b9f\u8df5\u7684\u306a\u30c6\u30af\u30cb\u30c3\u30af\u3092\u7d39\u4ecb\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-27\">\n<h2 class=\"wp-block-heading\" id=\"i-8\">\uff12\uff0e\u5b9f\u8df5\u3067\u4f7f\u3048\u308b7\u3064\u306e\u6587\u5b57\u5217\u7f6e\u63db\u30c6\u30af\u30cb\u30c3\u30af<\/h2>\n<\/div>\n\n<div id=\"sgb-css-id-28\">\n<p class=\"wp-block-paragraph\">\u30d7\u30ed\u30c0\u30af\u30b7\u30e7\u30f3\u74b0\u5883\u3067\u4f7f\u3048\u308b\u3001\u5b9f\u8df5\u7684\u306a\u6587\u5b57\u5217\u7f6e\u63db\u30c6\u30af\u30cb\u30c3\u30af\u3092\u7d39\u4ecb\u3057\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u30c6\u30af\u30cb\u30c3\u30af\u306f\u3001\u5b9f\u969b\u306e\u958b\u767a\u73fe\u5834\u3067\u3088\u304f\u906d\u9047\u3059\u308b\u8ab2\u984c\u306b\u5bfe\u5fdc\u3067\u304d\u308b\u3088\u3046\u306b\u8a2d\u8a08\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-29\">\n<h3 class=\"wp-block-heading\" id=\"i-9\">2.1 \u5358\u7d14\u306a\u6587\u5b57\u5217\u7f6e\u63db\uff1areplace\u30e1\u30bd\u30c3\u30c9\u306e\u6d3b\u7528\u6cd5<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-30\">\n<p class=\"wp-block-paragraph\">\u6700\u3082\u30b7\u30f3\u30d7\u30eb\u306a\u7f6e\u63db\u51e6\u7406\u304b\u3089\u3001\u5b9f\u8df5\u7684\u306a\u4f7f\u3044\u65b9\u3092\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class SimpleReplacementExample {\n    public static String sanitizeFileName(String fileName) {\n        \/\/ \u7981\u6b62\u6587\u5b57\u3092\u5b89\u5168\u306a\u6587\u5b57\u306b\u7f6e\u63db\n        return fileName\n            .replace('\\\\', '_')\n            .replace('\/', '_')\n            .replace(':', '_')\n            .replace('*', '_')\n            .replace('?', '_')\n            .replace('\"', '_')\n            .replace('&lt;', '_')\n            .replace('&gt;', '_')\n            .replace('|', '_');\n    }\n\n    public static void main(String[] args) {\n        String fileName = \"report:2023\/12*.txt\";\n        System.out.println(sanitizeFileName(fileName)); \/\/ \"report_2023_12_.txt\"\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-31\">\n<h3 class=\"wp-block-heading\" id=\"i-10\">2.2 \u8907\u6570\u7b87\u6240\u306e\u4e00\u62ec\u7f6e\u63db\uff1areplaceAll\u306e\u52b9\u7387\u7684\u306a\u4f7f\u3044\u65b9<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-32\">\n<p class=\"wp-block-paragraph\">\u6b63\u898f\u8868\u73fe\u3092\u4f7f\u7528\u3057\u3066\u3001\u8907\u6570\u306e\u30d1\u30bf\u30fc\u30f3\u3092\u52b9\u7387\u7684\u306b\u7f6e\u63db\u3059\u308b\u65b9\u6cd5\u3067\u3059\u3002<\/p>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class BatchReplacementExample {\n    public static String formatPhoneNumber(String phone) {\n        \/\/ \u4e0d\u8981\u306a\u6587\u5b57\u3092\u9664\u53bb\u3057\u3001\u4e00\u5b9a\u306e\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u306b\u6574\u5f62\n        return phone\n            .replaceAll(\"[^0-9]\", \"\") \/\/ \u6570\u5b57\u4ee5\u5916\u3092\u9664\u53bb\n            .replaceAll(\"(\\\\d{3})(\\\\d{4})(\\\\d{4})\", \"$1-$2-$3\");\n    }\n\n    public static void main(String[] args) {\n        String phone = \"090 1234 5678\";\n        System.out.println(formatPhoneNumber(phone)); \/\/ \"090-1234-5678\"\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-33\">\n<h3 class=\"wp-block-heading\" id=\"i-11\">2.3 \u5927\u6587\u5b57\u5c0f\u6587\u5b57\u3092\u533a\u5225\u3057\u306a\u3044\u7f6e\u63db\u51e6\u7406\u306e\u5b9f\u88c5<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-34\">\n<p class=\"wp-block-paragraph\">\u691c\u7d22\u6642\u306e\u5927\u6587\u5b57\u5c0f\u6587\u5b57\u3092\u7121\u8996\u3059\u308b\u5b9f\u88c5\u65b9\u6cd5\u3067\u3059\u3002<\/p>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class CaseInsensitiveReplacementExample {\n    public static String replaceIgnoreCase(String text, String target, String replacement) {\n        \/\/ \u5927\u6587\u5b57\u5c0f\u6587\u5b57\u3092\u533a\u5225\u305b\u305a\u306b\u7f6e\u63db\u3059\u308b\u305f\u3081\u306e\u6b63\u898f\u8868\u73fe\u30d1\u30bf\u30fc\u30f3\u3092\u4f5c\u6210\n        StringBuilder pattern = new StringBuilder();\n        for (char c : target.toCharArray()) {\n            pattern.append(\"[\")\n                   .append(Character.toLowerCase(c))\n                   .append(Character.toUpperCase(c))\n                   .append(\"]\");\n        }\n        return text.replaceAll(pattern.toString(), replacement);\n    }\n\n    public static void main(String[] args) {\n        String text = \"Hello HELLO hello\";\n        System.out.println(replaceIgnoreCase(text, \"hello\", \"Hi\")); \/\/ \"Hi Hi Hi\"\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-35\">\n<h3 class=\"wp-block-heading\" id=\"i-12\">2.4 \u6b63\u898f\u8868\u73fe\u3092\u4f7f\u7528\u3057\u305f\u9ad8\u5ea6\u306a\u7f6e\u63db\u51e6\u7406<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-36\">\n<p class=\"wp-block-paragraph\">\u8907\u96d1\u306a\u30d1\u30bf\u30fc\u30f3\u30de\u30c3\u30c1\u30f3\u30b0\u3092\u5fc5\u8981\u3068\u3059\u308b\u7f6e\u63db\u51e6\u7406\u306e\u5b9f\u88c5\u4f8b\u3067\u3059\u3002<\/p>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class AdvancedRegexReplacementExample {\n    public static String maskSensitiveData(String text) {\n        \/\/ \u30af\u30ec\u30b8\u30c3\u30c8\u30ab\u30fc\u30c9\u756a\u53f7\u3092\u30de\u30b9\u30af\n        String maskedCC = text.replaceAll(\"\\\\b\\\\d{4}[-\\\\s]?\\\\d{4}[-\\\\s]?\\\\d{4}[-\\\\s]?\\\\d{4}\\\\b\", \"****-****-****-****\");\n\n        \/\/ \u30e1\u30fc\u30eb\u30a2\u30c9\u30ec\u30b9\u3092\u90e8\u5206\u7684\u306b\u30de\u30b9\u30af\n        return maskedCC.replaceAll(\"([a-zA-Z0-9._-]+)@([a-zA-Z0-9._-]+\\\\.([a-zA-Z]{2,5}))\", \"$1@***.$3\");\n    }\n\n    public static void main(String[] args) {\n        String text = \"Contact: john.doe@example.com, Card: 1234-5678-9012-3456\";\n        System.out.println(maskSensitiveData(text));\n        \/\/ \u51fa\u529b: \"Contact: john.doe@***.com, Card: ****-****-****-****\"\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-37\">\n<h3 class=\"wp-block-heading\" id=\"i-13\">2.5 StringBuilder\/StringBuffer\u3092\u4f7f\u7528\u3057\u305f\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-38\">\n<p class=\"wp-block-paragraph\">\u5927\u91cf\u306e\u30c6\u30ad\u30b9\u30c8\u51e6\u7406\u3084\u7e70\u308a\u8fd4\u3057\u7f6e\u63db\u304c\u5fc5\u8981\u306a\u5834\u5408\u306e\u6700\u9069\u5316\u30c6\u30af\u30cb\u30c3\u30af\u3067\u3059\u3002<\/p>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class OptimizedReplacementExample {\n    public static String replaceMultipleOptimized(String text, Map&lt;String, String&gt; replacements) {\n        StringBuilder result = new StringBuilder(text);\n\n        for (Map.Entry&lt;String, String&gt; entry : replacements.entrySet()) {\n            String target = entry.getKey();\n            String replacement = entry.getValue();\n\n            int start = 0;\n            while ((start = result.indexOf(target, start)) != -1) {\n                result.replace(start, start + target.length(), replacement);\n                start += replacement.length();\n            }\n        }\n\n        return result.toString();\n    }\n\n    public static void main(String[] args) {\n        Map&lt;String, String&gt; replacements = new HashMap&lt;&gt;();\n        replacements.put(\"cat\", \"dog\");\n        replacements.put(\"black\", \"white\");\n\n        String text = \"The black cat saw another black cat.\";\n        System.out.println(replaceMultipleOptimized(text, replacements));\n        \/\/ \u51fa\u529b: \"The white dog saw another white dog.\"\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-39\">\n<h3 class=\"wp-block-heading\" id=\"i-14\">2.6 \u7279\u6b8a\u6587\u5b57\u306e\u7f6e\u63db\u306b\u304a\u3051\u308b\u30a8\u30b9\u30b1\u30fc\u30d7\u51e6\u7406<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-40\">\n<p class=\"wp-block-paragraph\">\u6b63\u898f\u8868\u73fe\u306e\u7279\u6b8a\u6587\u5b57\u3092\u6271\u3046\u969b\u306e\u5b89\u5168\u306a\u7f6e\u63db\u51e6\u7406\u65b9\u6cd5\u3067\u3059\u3002<\/p>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class SpecialCharacterReplacementExample {\n    public static String escapeRegexSpecialChars(String text) {\n        return text.replaceAll(\"[\\\\\\\\\\\\[\\\\]{}()*+?^$|.]\", \"\\\\\\\\$0\");\n    }\n\n    public static String replaceSpecialChars(String text, String target, String replacement) {\n        \/\/ \u7279\u6b8a\u6587\u5b57\u3092\u30a8\u30b9\u30b1\u30fc\u30d7\u3057\u3066\u5b89\u5168\u306b\u7f6e\u63db\n        String escapedTarget = escapeRegexSpecialChars(target);\n        return text.replaceAll(escapedTarget, replacement);\n    }\n\n    public static void main(String[] args) {\n        String text = \"This (text) contains [special] characters.\";\n        System.out.println(replaceSpecialChars(text, \"[special]\", \"normal\"));\n        \/\/ \u51fa\u529b: \"This (text) contains normal characters.\"\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-41\">\n<h3 class=\"wp-block-heading\" id=\"i-15\">2.7 \u6587\u5b57\u5217\u7f6e\u63db\u306e\u9023\u9396\u51e6\u7406\u30c6\u30af\u30cb\u30c3\u30af<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-42\">\n<p class=\"wp-block-paragraph\">\u8907\u6570\u306e\u7f6e\u63db\u51e6\u7406\u3092\u52b9\u7387\u7684\u306b\u9023\u9396\u3055\u305b\u308b\u65b9\u6cd5\u3067\u3059\u3002<\/p>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class ChainedReplacementExample {\n    public static class TextProcessor {\n        private String text;\n\n        public TextProcessor(String text) {\n            this.text = text;\n        }\n\n        public TextProcessor replaceIfMatches(String regex, String replacement) {\n            if (text.matches(\".*\" + regex + \".*\")) {\n                text = text.replaceAll(regex, replacement);\n            }\n            return this;\n        }\n\n        public TextProcessor replaceAll(String target, String replacement) {\n            text = text.replaceAll(target, replacement);\n            return this;\n        }\n\n        public String getText() {\n            return text;\n        }\n    }\n\n    public static void main(String[] args) {\n        String processed = new TextProcessor(\"Hello, World! 123\")\n            .replaceAll(\"World\", \"Java\")\n            .replaceIfMatches(\"\\\\d+\", \"***\")\n            .replaceAll(\"!\", \"!!\")\n            .getText();\n\n        System.out.println(processed); \/\/ \"Hello, Java!! ***\"\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-43\">\n<p class=\"wp-block-paragraph\">\u3053\u308c\u3089\u306e\u30c6\u30af\u30cb\u30c3\u30af\u3092\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001\u3088\u308a\u52b9\u7387\u7684\u3067\u4fdd\u5b88\u6027\u306e\u9ad8\u3044\u6587\u5b57\u5217\u7f6e\u63db\u51e6\u7406\u3092\u5b9f\u88c5\u3067\u304d\u307e\u3059\u3002\u6b21\u7ae0\u3067\u306f\u3001\u3053\u308c\u3089\u306e\u30c6\u30af\u30cb\u30c3\u30af\u3092\u4f7f\u7528\u3059\u308b\u969b\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3068\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-44\">\n<h2 class=\"wp-block-heading\" id=\"i-16\">\uff13\uff0e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3068\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/h2>\n<\/div>\n\n<div id=\"sgb-css-id-45\">\n<p class=\"wp-block-paragraph\">\u6587\u5b57\u5217\u7f6e\u63db\u51e6\u7406\u306f\u983b\u7e41\u306b\u4f7f\u7528\u3055\u308c\u308b\u64cd\u4f5c\u3067\u3042\u308a\u3001\u9069\u5207\u306a\u5b9f\u88c5\u65b9\u6cd5\u3092\u9078\u629e\u3059\u308b\u3053\u3068\u3067\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u5168\u4f53\u7684\u306a\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306b\u5927\u304d\u306a\u5f71\u97ff\u3092\u4e0e\u3048\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-46\">\n<h3 class=\"wp-block-heading\" id=\"i-17\">3.1 \u30e1\u30e2\u30ea\u52b9\u7387\u3092\u8003\u616e\u3057\u305f\u6587\u5b57\u5217\u7f6e\u63db\u306e\u5b9f\u88c5\u65b9\u6cd5<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-47\">\n<p class=\"wp-block-paragraph\">Java\u306e\u6587\u5b57\u5217\u64cd\u4f5c\u306b\u304a\u3051\u308b\u30e1\u30e2\u30ea\u52b9\u7387\u306b\u3064\u3044\u3066\u3001\u5b9f\u88c5\u65b9\u6cd5\u3054\u3068\u306e\u7279\u5fb4\u3092\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-48\">\n<h4 class=\"wp-block-heading\" id=\"i-18\">1. String vs StringBuilder \u306e\u4f7f\u3044\u5206\u3051<\/h4>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class StringReplacementPerformance {\n    public static String replaceWithString(String text, String target, String replacement, int times) {\n        String result = text;\n        for (int i = 0; i &lt; times; i++) {\n            result = result.replace(target, replacement);  \/\/ \u65b0\u3057\u3044String\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u751f\u6210\u3055\u308c\u308b\n        }\n        return result;\n    }\n\n    public static String replaceWithStringBuilder(String text, String target, String replacement, int times) {\n        StringBuilder result = new StringBuilder(text);\n        for (int i = 0; i &lt; times; i++) {\n            int index = result.indexOf(target);\n            if (index != -1) {\n                result.replace(index, index + target.length(), replacement);\n            }\n        }\n        return result.toString();\n    }\n\n    \/\/ \u30d9\u30f3\u30c1\u30de\u30fc\u30af\u7528\u306e\u30e1\u30a4\u30f3\u51e6\u7406\n    public static void main(String[] args) {\n        String text = \"Hello World Hello World Hello World\";\n\n        long startTime = System.nanoTime();\n        replaceWithString(text, \"World\", \"Java\", 1000);\n        long stringTime = System.nanoTime() - startTime;\n\n        startTime = System.nanoTime();\n        replaceWithStringBuilder(text, \"World\", \"Java\", 1000);\n        long stringBuilderTime = System.nanoTime() - startTime;\n\n        System.out.printf(\"String\u6642\u9593: %dms%n\", stringTime \/ 1000000);\n        System.out.printf(\"StringBuilder\u6642\u9593: %dms%n\", stringBuilderTime \/ 1000000);\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-49\">\n<p class=\"wp-block-paragraph\"><strong>\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u306e\u6bd4\u8f03\u8868\uff1a<\/strong><\/p>\n<\/div>\n\n<div id=\"id-fdc6076c-4e60-47e2-8887-c859ed9bd306\"><div id=\"sgb-css-id-50\">\n<figure class=\"wp-block-table\"><table><thead><tr><th>\u5b9f\u88c5\u65b9\u6cd5<\/th><th>\u30e1\u30e2\u30ea\u52b9\u7387<\/th><th>\u4f7f\u7528\u63a8\u5968\u30b7\u30fc\u30f3<\/th><\/tr><\/thead><tbody><tr><td><code>String#replace<\/code><\/td><td>\u4f4e<\/td><td>\u5358\u767a\u306e\u7f6e\u63db\u3001\u5c0f\u898f\u6a21\u30c6\u30ad\u30b9\u30c8<\/td><\/tr><tr><td><code>StringBuilder<\/code><\/td><td>\u9ad8<\/td><td>\u9023\u7d9a\u3057\u305f\u7f6e\u63db\u3001\u5927\u898f\u6a21\u30c6\u30ad\u30b9\u30c8<\/td><\/tr><tr><td><code>StringBuffer<\/code><\/td><td>\u4e2d<\/td><td>\u30de\u30eb\u30c1\u30b9\u30ec\u30c3\u30c9\u74b0\u5883\u3067\u306e\u7f6e\u63db<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div><\/div>\n\n<div id=\"sgb-css-id-51\">\n<h3 class=\"wp-block-heading\" id=\"i-19\">3.2 \u5927\u91cf\u30c7\u30fc\u30bf\u51e6\u7406\u6642\u306e\u6700\u9069\u5316\u30c6\u30af\u30cb\u30c3\u30af<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-52\">\n<p class=\"wp-block-paragraph\">\u5927\u91cf\u306e\u30c6\u30ad\u30b9\u30c8\u30c7\u30fc\u30bf\u3092\u51e6\u7406\u3059\u308b\u969b\u306e\u6700\u9069\u5316\u65b9\u6cd5\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class LargeTextProcessing {\n    public static class ChunkedTextProcessor {\n        private static final int CHUNK_SIZE = 8192; \/\/ 8KB\u306e\u30c1\u30e3\u30f3\u30af\n\n        public static String processLargeText(String input, Function&lt;String, String&gt; replacementFunc) {\n            if (input.length() &lt; CHUNK_SIZE) {\n                return replacementFunc.apply(input);\n            }\n\n            StringBuilder result = new StringBuilder(input.length());\n            for (int i = 0; i &lt; input.length(); i += CHUNK_SIZE) {\n                int end = Math.min(i + CHUNK_SIZE, input.length());\n                String chunk = input.substring(i, end);\n                result.append(replacementFunc.apply(chunk));\n            }\n\n            return result.toString();\n        }\n    }\n\n    \/\/ \u4f7f\u7528\u4f8b\n    public static void main(String[] args) {\n        String largeText = \"\u5927\u91cf\u306e\u30c6\u30ad\u30b9\u30c8\u30c7\u30fc\u30bf...\"; \/\/ \u5b9f\u969b\u306e\u5927\u91cf\u30c7\u30fc\u30bf\n\n        String processed = ChunkedTextProcessor.processLargeText(\n            largeText,\n            chunk -&gt; chunk.replaceAll(\"pattern\", \"replacement\")\n        );\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-57\">\n<div class=\"wp-block-sgb-block-simple sgb-box-simple sgb-box-simple--title-normal sgb-box-simple--with-border\"><div style=\"background-color:var(--wp--preset--color--sango-main);color:#FFF\" class=\"sgb-box-simple__title\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316\u306e\u305f\u3081\u306e\u30c1\u30a7\u30c3\u30af\u30ea\u30b9\u30c8<\/div><div class=\"sgb-box-simple__body\" style=\"border-color:var(--wp--preset--color--sango-main);background-color:#FFF\">\n<ul class=\"wp-block-list\"><div id=\"sgb-css-id-53\">\n<li>\u5165\u529b\u30c6\u30ad\u30b9\u30c8\u306e\u30b5\u30a4\u30ba\u306b\u5fdc\u3058\u305f\u5b9f\u88c5\u65b9\u6cd5\u306e\u9078\u629e<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-54\">\n<li>\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u306e\u30e2\u30cb\u30bf\u30ea\u30f3\u30b0<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-55\">\n<li>\u30c1\u30e3\u30f3\u30af\u51e6\u7406\u306e\u9069\u7528<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-56\">\n<li>\u30ad\u30e3\u30c3\u30b7\u30e5\u306e\u6d3b\u7528<\/li>\n<\/div>\n\n\n<li>\u6b63\u898f\u8868\u73fe\u30d1\u30bf\u30fc\u30f3\u306e\u30d7\u30ea\u30b3\u30f3\u30d1\u30a4\u30eb<\/li>\n<\/ul>\n<\/div><\/div>\n<\/div>\n\n<div id=\"sgb-css-id-58\">\n<h3 class=\"wp-block-heading\" id=\"i-20\">3.3 \u6587\u5b57\u5217\u7f6e\u63db\u51e6\u7406\u306e\u30e6\u30cb\u30c3\u30c8\u30c6\u30b9\u30c8\u4f5c\u6210\u65b9\u6cd5<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-59\">\n<p class=\"wp-block-paragraph\">\u52b9\u679c\u7684\u306a\u30e6\u30cb\u30c3\u30c8\u30c6\u30b9\u30c8\u306e\u4f5c\u6210\u65b9\u6cd5\u306b\u3064\u3044\u3066\u3001JUnit\u3092\u4f7f\u7528\u3057\u305f\u4f8b\u3092\u793a\u3057\u307e\u3059\u3002<\/p>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">import org.junit.jupiter.api.Test;\nimport org.junit.jupiter.params.ParameterizedTest;\nimport org.junit.jupiter.params.provider.CsvSource;\nimport static org.junit.jupiter.api.Assertions.*;\n\npublic class StringReplacementTest {\n    private final StringReplacer replacer = new StringReplacer();\n\n    @Test\n    void testBasicReplacement() {\n        String input = \"Hello World\";\n        String expected = \"Hello Java\";\n        String actual = replacer.replace(input, \"World\", \"Java\");\n        assertEquals(expected, actual, \"Basic replacement failed\");\n    }\n\n    @ParameterizedTest\n    @CsvSource({\n        \"Hello World, World, Java, Hello Java\",\n        \"Hello, World, Java, Hello\",\n        \"'', World, Java, ''\",\n        \"WorldWorld, World, Java, JavaJava\"\n    })\n    void testVariousReplacements(String input, String target, \n                               String replacement, String expected) {\n        String actual = replacer.replace(input, target, replacement);\n        assertEquals(expected, actual);\n    }\n\n    @Test\n    void testPerformanceWithLargeText() {\n        String largeText = \"a\".repeat(1000000);\n        long startTime = System.nanoTime();\n\n        replacer.replace(largeText, \"a\", \"b\");\n\n        long duration = (System.nanoTime() - startTime) \/ 1000000; \/\/ \u30df\u30ea\u79d2\u306b\u5909\u63db\n        assertTrue(duration &lt; 1000, \"Performance test failed: took \" + duration + \"ms\");\n    }\n\n    @Test\n    void testMemoryEfficiency() {\n        String largeText = \"a\".repeat(1000000);\n        Runtime runtime = Runtime.getRuntime();\n\n        long beforeMemory = runtime.totalMemory() - runtime.freeMemory();\n        replacer.replace(largeText, \"a\", \"b\");\n        long afterMemory = runtime.totalMemory() - runtime.freeMemory();\n\n        long memoryUsed = (afterMemory - beforeMemory) \/ (1024 * 1024); \/\/ MB\u306b\u5909\u63db\n        assertTrue(memoryUsed &lt; 100, \"Memory usage too high: \" + memoryUsed + \"MB\");\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-66\">\n<div class=\"wp-block-sgb-block-simple sgb-box-simple sgb-box-simple--title-normal sgb-box-simple--with-border\"><div style=\"background-color:var(--wp--preset--color--sango-main);color:#FFF\" class=\"sgb-box-simple__title\">\u30c6\u30b9\u30c8\u30ab\u30d0\u30ec\u30c3\u30b8\u306e\u63a8\u5968\u9805\u76ee<\/div><div class=\"sgb-box-simple__body\" style=\"border-color:var(--wp--preset--color--sango-main);background-color:#FFF\">\n<ol class=\"wp-block-list\"><div id=\"sgb-css-id-60\">\n<li>\u57fa\u672c\u7684\u306a\u7f6e\u63db\u6a5f\u80fd<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-61\">\n<li>\u30a8\u30c3\u30b8\u30b1\u30fc\u30b9\uff08\u7a7a\u6587\u5b57\u5217\u3001null\u3001\u7279\u6b8a\u6587\u5b57\u306a\u3069\uff09<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-62\">\n<li>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u8981\u4ef6<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-63\">\n<li>\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-64\">\n<li>\u5927\u898f\u6a21\u30c7\u30fc\u30bf\u3067\u306e\u52d5\u4f5c<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-65\">\n<li>\u6b63\u898f\u8868\u73fe\u30d1\u30bf\u30fc\u30f3\u306e\u6b63\u78ba\u6027<\/li>\n<\/div>\n\n\n<li>\u30de\u30eb\u30c1\u30b9\u30ec\u30c3\u30c9\u74b0\u5883\u3067\u306e\u5b89\u5168\u6027<\/li>\n<\/ol>\n<\/div><\/div>\n<\/div>\n\n<div id=\"sgb-css-id-67\">\n<p class=\"wp-block-paragraph\">\u3053\u308c\u3089\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u3068\u6700\u9069\u5316\u30c6\u30af\u30cb\u30c3\u30af\u3092\u9069\u5207\u306b\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001\u52b9\u7387\u7684\u3067\u4fe1\u983c\u6027\u306e\u9ad8\u3044\u6587\u5b57\u5217\u7f6e\u63db\u51e6\u7406\u3092\u5b9f\u88c5\u3067\u304d\u307e\u3059\u3002\u6b21\u7ae0\u3067\u306f\u3001\u5b9f\u88c5\u6642\u306b\u3088\u304f\u906d\u9047\u3059\u308b\u30a8\u30e9\u30fc\u3068\u305d\u306e\u5bfe\u51e6\u6cd5\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-68\">\n<h2 class=\"wp-block-heading\" id=\"i-21\">\uff14\uff0e\u3088\u304f\u3042\u308b\u30a8\u30e9\u30fc\u3068\u5bfe\u51e6\u6cd5<\/h2>\n<\/div>\n\n<div id=\"sgb-css-id-69\">\n<p class=\"wp-block-paragraph\">\u6587\u5b57\u5217\u7f6e\u63db\u51e6\u7406\u3092\u5b9f\u88c5\u3059\u308b\u969b\u306b\u3088\u304f\u906d\u9047\u3059\u308b\u30a8\u30e9\u30fc\u3068\u305d\u306e\u5bfe\u51e6\u6cd5\u306b\u3064\u3044\u3066\u3001\u5b9f\u8df5\u7684\u306a\u4f8b\u3092\u4ea4\u3048\u3066\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-70\">\n<h3 class=\"wp-block-heading\" id=\"i-22\">4.1 NullPointerException\u3092\u9632\u3050\u5b89\u5168\u306a\u5b9f\u88c5<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-71\">\n<p class=\"wp-block-paragraph\">NullPointerException\u306f\u6587\u5b57\u5217\u51e6\u7406\u3067\u6700\u3082\u983b\u7e41\u306b\u906d\u9047\u3059\u308b\u30a8\u30e9\u30fc\u306e\u4e00\u3064\u3067\u3059\u3002\u4ee5\u4e0b\u306b\u3001\u5b89\u5168\u306a\u5b9f\u88c5\u30d1\u30bf\u30fc\u30f3\u3092\u793a\u3057\u307e\u3059\u3002<\/p>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class SafeStringReplacement {\n    public static String safeReplace(String text, String target, String replacement) {\n        \/\/ null \u30c1\u30a7\u30c3\u30af\u3068\u65e9\u671f\u30ea\u30bf\u30fc\u30f3\n        if (text == null) return \"\";\n        if (target == null || replacement == null) return text;\n\n        try {\n            return text.replace(target, replacement);\n        } catch (Exception e) {\n            \/\/ \u30a8\u30e9\u30fc\u30ed\u30b0\u306e\u8a18\u9332\n            logger.error(\"\u6587\u5b57\u5217\u7f6e\u63db\u51e6\u7406\u3067\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u307e\u3057\u305f\", e);\n            return text; \/\/ \u5143\u306e\u30c6\u30ad\u30b9\u30c8\u3092\u8fd4\u3059\n        }\n    }\n\n    \/\/ \u3088\u308a\u5805\u7262\u306a\u5b9f\u88c5\u4f8b\n    public static class StringReplacer {\n        private final String defaultValue;\n\n        public StringReplacer(String defaultValue) {\n            this.defaultValue = defaultValue;\n        }\n\n        public String replace(String text, String target, String replacement) {\n            if (text == null) return defaultValue;\n            if (target == null || target.isEmpty()) return text;\n            return text.replace(target, \n                              replacement != null ? replacement : \"\");\n        }\n    }\n\n    public static void main(String[] args) {\n        StringReplacer replacer = new StringReplacer(\"\");\n\n        \/\/ \u5b89\u5168\u306a\u7f6e\u63db\u51e6\u7406\u306e\u4f8b\n        System.out.println(replacer.replace(null, \"old\", \"new\")); \/\/ \"\"\n        System.out.println(replacer.replace(\"text\", null, \"new\")); \/\/ \"text\"\n        System.out.println(replacer.replace(\"text\", \"t\", null)); \/\/ \"ex\"\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-76\">\n<div class=\"wp-block-sgb-block-simple sgb-box-simple sgb-box-simple--title-normal sgb-box-simple--with-border\"><div style=\"background-color:var(--wp--preset--color--sango-main);color:#FFF\" class=\"sgb-box-simple__title\">\u30a8\u30e9\u30fc\u9632\u6b62\u306e\u305f\u3081\u306e\u30c1\u30a7\u30c3\u30af\u30ea\u30b9\u30c8<\/div><div class=\"sgb-box-simple__body\" style=\"border-color:var(--wp--preset--color--sango-main);background-color:#FFF\">\n<ul class=\"wp-block-list\"><div id=\"sgb-css-id-72\">\n<li>\u5165\u529b\u5024\u306enull\u30c1\u30a7\u30c3\u30af<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-73\">\n<li>\u7a7a\u6587\u5b57\u5217\u306e\u30cf\u30f3\u30c9\u30ea\u30f3\u30b0<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-74\">\n<li>\u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u306e\u8a2d\u5b9a<\/li>\n<\/div>\n\n<div id=\"sgb-css-id-75\">\n<li>\u4f8b\u5916\u51e6\u7406\u306e\u5b9f\u88c5<\/li>\n<\/div>\n\n\n<li>\u30a8\u30e9\u30fc\u30ed\u30b0\u306e\u8a18\u9332<\/li>\n<\/ul>\n<\/div><\/div>\n<\/div>\n\n<div id=\"sgb-css-id-77\">\n<h3 class=\"wp-block-heading\" id=\"i-23\">4.2 \u6b63\u898f\u8868\u73fe\u306e\u30d1\u30bf\u30fc\u30f3\u30de\u30c3\u30c1\u30f3\u30b0\u5931\u6557\u3078\u306e\u5bfe\u5fdc<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-78\">\n<p class=\"wp-block-paragraph\">\u6b63\u898f\u8868\u73fe\u4f7f\u7528\u6642\u306e\u4e00\u822c\u7684\u306a\u554f\u984c\u3068\u5bfe\u51e6\u65b9\u6cd5\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class RegexReplacementErrorHandler {\n    private static final Pattern UNSAFE_PATTERN = Pattern.compile(\"[a-zA-Z]+\");\n\n    public static String handleRegexReplacement(String text, String regex, String replacement) {\n        try {\n            Pattern pattern = Pattern.compile(regex);\n            return pattern.matcher(text).replaceAll(replacement);\n        } catch (PatternSyntaxException e) {\n            \/\/ \u6b63\u898f\u8868\u73fe\u30d1\u30bf\u30fc\u30f3\u304c\u7121\u52b9\u306a\u5834\u5408\u306e\u51e6\u7406\n            logger.error(\"\u7121\u52b9\u306a\u6b63\u898f\u8868\u73fe\u30d1\u30bf\u30fc\u30f3: \" + regex, e);\n            return text;\n        } catch (IllegalArgumentException e) {\n            \/\/ replacement\u306b\u7121\u52b9\u306a\u53c2\u7167\u304c\u542b\u307e\u308c\u308b\u5834\u5408\u306e\u51e6\u7406\n            logger.error(\"\u7121\u52b9\u306a\u7f6e\u63db\u6587\u5b57\u5217: \" + replacement, e);\n            return text;\n        }\n    }\n\n    \/\/ \u6b63\u898f\u8868\u73fe\u306e\u30d0\u30ea\u30c7\u30fc\u30b7\u30e7\u30f3\n    public static boolean isValidRegex(String regex) {\n        try {\n            Pattern.compile(regex);\n            return true;\n        } catch (PatternSyntaxException e) {\n            return false;\n        }\n    }\n\n    \/\/ \u3088\u304f\u3042\u308b\u6b63\u898f\u8868\u73fe\u30a8\u30e9\u30fc\u306e\u30c7\u30e2\n    public static void main(String[] args) {\n        \/\/ 1. \u7121\u52b9\u306a\u6b63\u898f\u8868\u73fe\n        System.out.println(handleRegexReplacement(\"test\", \"[\", \"replacement\"));\n\n        \/\/ 2. \u4e0d\u6b63\u306a\u5f8c\u65b9\u53c2\u7167\n        System.out.println(handleRegexReplacement(\"test\", \"(\\\\w+)\", \"$2\"));\n\n        \/\/ 3. \u5927\u304d\u306a\u5165\u529b\u306b\u5bfe\u3059\u308b\u5236\u5fa1\u4e0d\u80fd\u306a\u30d0\u30c3\u30af\u30c8\u30e9\u30c3\u30ad\u30f3\u30b0\n        String input = \"a\".repeat(100);\n        System.out.println(handleRegexReplacement(input, \"(a+)*b\", \"x\"));\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-79\">\n<p class=\"wp-block-paragraph\"><strong>\u6b63\u898f\u8868\u73fe\u4f7f\u7528\u6642\u306e\u6ce8\u610f\u70b9\uff1a<\/strong><\/p>\n<\/div>\n\n<div id=\"id-b46fe06c-e5ac-4662-9639-fb38c64a91ef\"><div id=\"sgb-css-id-80\">\n<figure class=\"wp-block-table\"><table><thead><tr><th>\u30a8\u30e9\u30fc\u30d1\u30bf\u30fc\u30f3<\/th><th>\u539f\u56e0<\/th><th>\u5bfe\u51e6\u65b9\u6cd5<\/th><\/tr><\/thead><tbody><tr><td><code>PatternSyntaxException<\/code><\/td><td>\u4e0d\u6b63\u306a\u6b63\u898f\u8868\u73fe\u69cb\u6587<\/td><td>\u30d1\u30bf\u30fc\u30f3\u306e\u30d0\u30ea\u30c7\u30fc\u30b7\u30e7\u30f3\u5b9f\u65bd<\/td><\/tr><tr><td><code>StackOverflowError<\/code><\/td><td>\u904e\u5ea6\u306a\u30d0\u30c3\u30af\u30c8\u30e9\u30c3\u30ad\u30f3\u30b0<\/td><td>\u30d1\u30bf\u30fc\u30f3\u306e\u6700\u9069\u5316\u3001\u5165\u529b\u5236\u9650<\/td><\/tr><tr><td><code>IllegalArgumentException<\/code><\/td><td>\u4e0d\u6b63\u306a\u7f6e\u63db\u6587\u5b57\u5217<\/td><td>\u7f6e\u63db\u6587\u5b57\u5217\u306e\u30a8\u30b9\u30b1\u30fc\u30d7\u51e6\u7406<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div><\/div>\n\n<div id=\"sgb-css-id-81\">\n<h3 class=\"wp-block-heading\" id=\"i-24\">4.3 \u6587\u5b57\u30a8\u30f3\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u306b\u95a2\u3059\u308b\u554f\u984c\u306e\u89e3\u6c7a\u65b9\u6cd5<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-82\">\n<p class=\"wp-block-paragraph\">\u6587\u5b57\u30a8\u30f3\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u306b\u95a2\u9023\u3059\u308b\u554f\u984c\u3068\u5bfe\u51e6\u65b9\u6cd5\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u307e\u3059\u3002<\/p>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class EncodingErrorHandler {\n    public static String handleEncodingReplacement(String text, String target, \n                                                 String replacement, String encoding) {\n        try {\n            \/\/ \u5165\u529b\u30c6\u30ad\u30b9\u30c8\u306e\u30a8\u30f3\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u3092\u660e\u793a\u7684\u306b\u51e6\u7406\n            byte[] bytes = text.getBytes(encoding);\n            String encodedText = new String(bytes, encoding);\n\n            \/\/ \u30a8\u30f3\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u3092\u8003\u616e\u3057\u305f\u7f6e\u63db\u51e6\u7406\n            return encodedText.replace(target, replacement);\n\n        } catch (UnsupportedEncodingException e) {\n            logger.error(\"\u30b5\u30dd\u30fc\u30c8\u3055\u308c\u3066\u3044\u306a\u3044\u30a8\u30f3\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0: \" + encoding, e);\n            return text;\n        }\n    }\n\n    \/\/ \u30a8\u30f3\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u95a2\u9023\u306e\u4e00\u822c\u7684\u306a\u554f\u984c\u306b\u5bfe\u3059\u308b\u5bfe\u51e6\n    public static class EncodingAwareReplacer {\n        private final String defaultEncoding;\n        private final CharsetDecoder decoder;\n\n        public EncodingAwareReplacer(String encoding) {\n            this.defaultEncoding = encoding;\n            this.decoder = Charset.forName(encoding).newDecoder()\n                .onMalformedInput(CodingErrorAction.REPLACE)\n                .onUnmappableCharacter(CodingErrorAction.REPLACE);\n        }\n\n        public String replaceWithEncoding(String text, String target, \n                                        String replacement) {\n            try {\n                \/\/ \u6587\u5b57\u30a8\u30f3\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u3092\u8003\u616e\u3057\u305f\u7f6e\u63db\u51e6\u7406\n                ByteBuffer bytes = ByteBuffer.wrap(\n                    text.getBytes(defaultEncoding));\n                CharBuffer chars = decoder.decode(bytes);\n                return chars.toString().replace(target, replacement);\n\n            } catch (CharacterCodingException e) {\n                logger.error(\"\u6587\u5b57\u30a8\u30f3\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u30a8\u30e9\u30fc\", e);\n                return text;\n            }\n        }\n    }\n\n    public static void main(String[] args) {\n        EncodingAwareReplacer replacer = new EncodingAwareReplacer(\"UTF-8\");\n\n        \/\/ \u7570\u306a\u308b\u30a8\u30f3\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u306e\u30c6\u30ad\u30b9\u30c8\u3092\u51e6\u7406\n        String text = \"\u3053\u3093\u306b\u3061\u306f\u4e16\u754c\";\n        String result = replacer.replaceWithEncoding(text, \"\u4e16\u754c\", \"World\");\n        System.out.println(result); \/\/ \"\u3053\u3093\u306b\u3061\u306fWorld\"\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-83\">\n<p class=\"wp-block-paragraph\">\u30a8\u30f3\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u95a2\u9023\u306e\u554f\u984c\u89e3\u6c7a\u306e\u305f\u3081\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\uff1a<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-84\">\n<p class=\"wp-block-paragraph\">\u30001. \u660e\u793a\u7684\u306a\u30a8\u30f3\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u6307\u5b9a<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-85\">\n<p class=\"wp-block-paragraph\">\u3000\u3000\u25cf \u5e38\u306b\u30a8\u30f3\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u3092\u660e\u793a\u7684\u306b\u6307\u5b9a\u3059\u308b<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-86\">\n<p class=\"wp-block-paragraph\">\u3000\u3000\u25cf \u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u5168\u4f53\u3067\u4e00\u8cab\u3057\u305f\u30a8\u30f3\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u3092\u4f7f\u7528\u3059\u308b<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-87\">\n<p class=\"wp-block-paragraph\">\u30002. \u30a8\u30e9\u30fc\u51e6\u7406\u306e\u5b9f\u88c5<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-88\">\n<p class=\"wp-block-paragraph\">\u3000\u3000\u25cf \u30a8\u30f3\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u5909\u63db\u30a8\u30e9\u30fc\u306e\u9069\u5207\u306a\u51e6\u7406<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-89\">\n<p class=\"wp-block-paragraph\">\u3000\u3000\u25cf \u4ee3\u66ff\u6587\u5b57\u306e\u8a2d\u5b9a<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-90\">\n<p class=\"wp-block-paragraph\">\u3000\u3000\u25cf \u30a8\u30e9\u30fc\u30ed\u30b0\u306e\u8a18\u9332<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-91\">\n<p class=\"wp-block-paragraph\">\u30003. \u5165\u529b\u691c\u8a3c<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-92\">\n<p class=\"wp-block-paragraph\">\u3000\u3000\u25cf \u30d0\u30a4\u30c8\u30aa\u30fc\u30c0\u30fc\u30de\u30fc\u30af\u306e\u51e6\u7406<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-93\">\n<p class=\"wp-block-paragraph\">\u3000\u3000\u25cf \u4e0d\u6b63\u306a\u6587\u5b57\u30b7\u30fc\u30b1\u30f3\u30b9\u306e\u30c1\u30a7\u30c3\u30af<\/p>\n<\/div>\n\n\n<p class=\"wp-block-paragraph\">\u3000\u3000\u25cf \u30a8\u30f3\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u4e92\u63db\u6027\u306e\u78ba\u8a8d<\/p>\n\n\n<div id=\"sgb-css-id-94\">\n<p class=\"wp-block-paragraph\">\u3053\u308c\u3089\u306e\u30a8\u30e9\u30fc\u5bfe\u7b56\u3092\u9069\u5207\u306b\u5b9f\u88c5\u3059\u308b\u3053\u3068\u3067\u3001\u3088\u308a\u5805\u7262\u306a\u6587\u5b57\u5217\u7f6e\u63db\u51e6\u7406\u3092\u5b9f\u73fe\u3067\u304d\u307e\u3059\u3002\u6b21\u7ae0\u3067\u306f\u3001\u3053\u308c\u3089\u306e\u77e5\u8b58\u3092\u6d3b\u7528\u3057\u305f\u5b9f\u8df5\u7684\u306a\u30e6\u30fc\u30b9\u30b1\u30fc\u30b9\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-95\">\n<h2 class=\"wp-block-heading\" id=\"i-25\">\uff15\uff0e\u5b9f\u8df5\u7684\u306a\u30e6\u30fc\u30b9\u30b1\u30fc\u30b9\u96c6<\/h2>\n<\/div>\n\n<div id=\"sgb-css-id-96\">\n<p class=\"wp-block-paragraph\">\u5b9f\u969b\u306e\u958b\u767a\u73fe\u5834\u3067\u3088\u304f\u906d\u9047\u3059\u308b\u6587\u5b57\u5217\u7f6e\u63db\u306e\u5b9f\u8df5\u7684\u306a\u30e6\u30fc\u30b9\u30b1\u30fc\u30b9\u306b\u3064\u3044\u3066\u3001\u5177\u4f53\u7684\u306a\u5b9f\u88c5\u4f8b\u3068\u5171\u306b\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-97\">\n<h3 class=\"wp-block-heading\" id=\"i-26\">5.1 CSV\u30d5\u30a1\u30a4\u30eb\u51e6\u7406\u3067\u306e\u6587\u5b57\u5217\u7f6e\u63db\u6d3b\u7528\u4f8b<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-98\">\n<p class=\"wp-block-paragraph\">CSV\u30d5\u30a1\u30a4\u30eb\u306e\u51e6\u7406\u306f\u696d\u52d9\u30b7\u30b9\u30c6\u30e0\u3067\u3088\u304f\u4f7f\u7528\u3055\u308c\u308b\u30b1\u30fc\u30b9\u3067\u3059\u3002\u4ee5\u4e0b\u306b\u3001\u5b89\u5168\u3067\u52b9\u7387\u7684\u306a\u5b9f\u88c5\u4f8b\u3092\u793a\u3057\u307e\u3059\u3002<\/p>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class CsvProcessor {\n    private static final String CSV_DELIMITER = \",\";\n    private static final String QUOTE = \"\\\"\";\n\n    public static class CsvLine {\n        private final List&lt;String&gt; values;\n\n        public CsvLine(String line) {\n            this.values = parseCsvLine(line);\n        }\n\n        private List&lt;String&gt; parseCsvLine(String line) {\n            List&lt;String&gt; result = new ArrayList&lt;&gt;();\n            boolean inQuotes = false;\n            StringBuilder field = new StringBuilder();\n\n            for (char c : line.toCharArray()) {\n                if (c == '\"') {\n                    inQuotes = !inQuotes;\n                } else if (c == ',' &amp;&amp; !inQuotes) {\n                    result.add(field.toString().trim());\n                    field.setLength(0);\n                } else {\n                    field.append(c);\n                }\n            }\n            result.add(field.toString().trim());\n            return result;\n        }\n\n        public String sanitizeField(int index) {\n            if (index &gt;= values.size()) return \"\";\n\n            return values.get(index)\n                .replace(QUOTE, QUOTE + QUOTE) \/\/ \u30a8\u30b9\u30b1\u30fc\u30d7\u51e6\u7406\n                .replaceAll(\"[\\\\r\\\\n]+\", \" \") \/\/ \u6539\u884c\u3092\u7a7a\u767d\u306b\u7f6e\u63db\n                .trim();\n        }\n\n        public String toString() {\n            return values.stream()\n                .map(value -&gt; QUOTE + value + QUOTE)\n                .collect(Collectors.joining(CSV_DELIMITER));\n        }\n    }\n\n    public static void processCsvFile(Path inputPath, Path outputPath) {\n        try (BufferedReader reader = Files.newBufferedReader(inputPath);\n             BufferedWriter writer = Files.newBufferedWriter(outputPath)) {\n\n            String line;\n            while ((line = reader.readLine()) != null) {\n                CsvLine csvLine = new CsvLine(line);\n                \/\/ \u5404\u30d5\u30a3\u30fc\u30eb\u30c9\u306e\u51e6\u7406\n                String processed = IntStream.range(0, csvLine.values.size())\n                    .mapToObj(csvLine::sanitizeField)\n                    .collect(Collectors.joining(CSV_DELIMITER));\n\n                writer.write(processed);\n                writer.newLine();\n            }\n        } catch (IOException e) {\n            logger.error(\"CSV\u30d5\u30a1\u30a4\u30eb\u51e6\u7406\u3067\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u307e\u3057\u305f\", e);\n        }\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-99\">\n<h3 class=\"wp-block-heading\" id=\"i-27\">5.2 \u30ed\u30b0\u51e6\u7406\u306b\u304a\u3051\u308b\u6a5f\u5bc6\u60c5\u5831\u306e\u7f6e\u63db\u30c6\u30af\u30cb\u30c3\u30af<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-100\">\n<p class=\"wp-block-paragraph\">\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u3092\u8003\u616e\u3057\u305f\u30ed\u30b0\u51e6\u7406\u306e\u5b9f\u88c5\u4f8b\u3067\u3059\u3002<\/p>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class SecureLogProcessor {\n    private static final Pattern CREDIT_CARD_PATTERN = \n        Pattern.compile(\"\\\\b\\\\d{4}[- ]?\\\\d{4}[- ]?\\\\d{4}[- ]?\\\\d{4}\\\\b\");\n    private static final Pattern EMAIL_PATTERN = \n        Pattern.compile(\"\\\\b[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\\\\.[A-Za-z]{2,6}\\\\b\");\n    private static final Pattern PASSWORD_PATTERN = \n        Pattern.compile(\"password[=:]\\\\s*['\\\"](.*?)['\\\"]\", Pattern.CASE_INSENSITIVE);\n\n    public static class LogMasker {\n        private final List&lt;Pattern&gt; patternsToMask;\n        private final String maskChar;\n\n        public LogMasker(String maskChar) {\n            this.maskChar = maskChar;\n            this.patternsToMask = new ArrayList&lt;&gt;();\n            \/\/ \u30c7\u30d5\u30a9\u30eb\u30c8\u306e\u6a5f\u5bc6\u60c5\u5831\u30d1\u30bf\u30fc\u30f3\u3092\u8ffd\u52a0\n            patternsToMask.add(CREDIT_CARD_PATTERN);\n            patternsToMask.add(EMAIL_PATTERN);\n            patternsToMask.add(PASSWORD_PATTERN);\n        }\n\n        public String maskSensitiveInfo(String logMessage) {\n            if (logMessage == null || logMessage.isEmpty()) {\n                return logMessage;\n            }\n\n            String masked = logMessage;\n            for (Pattern pattern : patternsToMask) {\n                Matcher matcher = pattern.matcher(masked);\n                masked = matcher.replaceAll(mr -&gt; {\n                    String match = mr.group();\n                    \/\/ \u30af\u30ec\u30b8\u30c3\u30c8\u30ab\u30fc\u30c9\u756a\u53f7\u306e\u5834\u5408\u3001\u6700\u5f8c\u306e4\u6841\u306f\u8868\u793a\n                    if (pattern.equals(CREDIT_CARD_PATTERN)) {\n                        return match.substring(match.length() - 4)\n                            .padStart(match.length(), '*');\n                    }\n                    \/\/ \u30e1\u30fc\u30eb\u30a2\u30c9\u30ec\u30b9\u306e\u5834\u5408\u3001@\u306e\u524d\u5f8c\u3067\u5206\u5272\u3057\u3066\u4e00\u90e8\u3092\u30de\u30b9\u30af\n                    if (pattern.equals(EMAIL_PATTERN)) {\n                        String[] parts = match.split(\"@\");\n                        return parts[0].substring(0, 2) + \"***@\" + parts[1];\n                    }\n                    \/\/ \u305d\u306e\u4ed6\u306e\u6a5f\u5bc6\u60c5\u5831\u306f\u5b8c\u5168\u306b\u30de\u30b9\u30af\n                    return maskChar.repeat(match.length());\n                });\n            }\n            return masked;\n        }\n    }\n\n    public static void main(String[] args) {\n        LogMasker masker = new LogMasker(\"*\");\n        String log = \"User email: john.doe@example.com, CC: 4111-1111-1111-1111\";\n        System.out.println(masker.maskSensitiveInfo(log));\n        \/\/ \u51fa\u529b: \"User email: jo***@example.com, CC: ************1111\"\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-101\">\n<h3 class=\"wp-block-heading\" id=\"i-28\">5.3 Web API\u30ec\u30b9\u30dd\u30f3\u30b9\u306e\u6587\u5b57\u5217\u52a0\u5de5\u5b9f\u88c5\u4f8b<\/h3>\n<\/div>\n\n<div id=\"sgb-css-id-102\">\n<p class=\"wp-block-paragraph\">RESTful API\u306e\u30ec\u30b9\u30dd\u30f3\u30b9\u51e6\u7406\u306b\u304a\u3051\u308b\u6587\u5b57\u5217\u52a0\u5de5\u306e\u5b9f\u88c5\u4f8b\u3067\u3059\u3002<\/p>\n<\/div>\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class ApiResponseProcessor {\n    private static final ObjectMapper mapper = new ObjectMapper();\n\n    public static class ApiResponse {\n        private String status;\n        private Object data;\n        private String message;\n\n        \/\/ getters, setters\n    }\n\n    public static class ResponseSanitizer {\n        private final Set&lt;String&gt; fieldsToSanitize;\n        private final Pattern htmlPattern = \n            Pattern.compile(\"&lt;[^&gt;]*&gt;\");\n        private final Pattern scriptPattern = \n            Pattern.compile(\"&lt;script[^&gt;]*&gt;.*?&lt;\/script&gt;\", \n                          Pattern.DOTALL | Pattern.CASE_INSENSITIVE);\n\n        public ResponseSanitizer(Set&lt;String&gt; fieldsToSanitize) {\n            this.fieldsToSanitize = fieldsToSanitize;\n        }\n\n        public String sanitizeResponse(String jsonResponse) {\n            try {\n                JsonNode root = mapper.readTree(jsonResponse);\n                sanitizeNode(root);\n                return mapper.writeValueAsString(root);\n            } catch (JsonProcessingException e) {\n                logger.error(\"JSON\u306e\u51e6\u7406\u306b\u5931\u6557\u3057\u307e\u3057\u305f\", e);\n                return jsonResponse;\n            }\n        }\n\n        private void sanitizeNode(JsonNode node) {\n            if (node.isObject()) {\n                ((ObjectNode) node).fields().forEachRemaining(entry -&gt; {\n                    if (fieldsToSanitize.contains(entry.getKey())) {\n                        String sanitized = sanitizeContent(\n                            entry.getValue().asText());\n                        ((ObjectNode) node).put(entry.getKey(), sanitized);\n                    } else if (entry.getValue().isContainerNode()) {\n                        sanitizeNode(entry.getValue());\n                    }\n                });\n            } else if (node.isArray()) {\n                node.forEach(this::sanitizeNode);\n            }\n        }\n\n        private String sanitizeContent(String content) {\n            String sanitized = content;\n            \/\/ HTML\u30bf\u30b0\u306e\u524a\u9664\n            sanitized = htmlPattern.matcher(sanitized).replaceAll(\"\");\n            \/\/ \u30b9\u30af\u30ea\u30d7\u30c8\u306e\u524a\u9664\n            sanitized = scriptPattern.matcher(sanitized).replaceAll(\"\");\n            \/\/ \u7279\u6b8a\u6587\u5b57\u306e\u30a8\u30b9\u30b1\u30fc\u30d7\n            sanitized = StringEscapeUtils.escapeHtml4(sanitized);\n            return sanitized.trim();\n        }\n    }\n\n    public static void main(String[] args) {\n        Set&lt;String&gt; fieldsToSanitize = new HashSet&lt;&gt;(\n            Arrays.asList(\"description\", \"comment\", \"userInput\"));\n        ResponseSanitizer sanitizer = new ResponseSanitizer(fieldsToSanitize);\n\n        String response = \"{\\\"status\\\":\\\"success\\\",\" +\n            \"\\\"data\\\":{\\\"description\\\":\\\"&lt;script&gt;alert('xss');&lt;\/script&gt;\\\"}}\";\n\n        String sanitized = sanitizer.sanitizeResponse(response);\n        System.out.println(sanitized);\n        \/\/ \u51fa\u529b: {\"status\":\"success\",\"data\":{\"description\":\"alert('xss');\"}}\n    }\n}<\/pre>\n\n\n<div id=\"sgb-css-id-103\">\n<p class=\"wp-block-paragraph\">\u3053\u308c\u3089\u306e\u30e6\u30fc\u30b9\u30b1\u30fc\u30b9\u306f\u3001\u5b9f\u969b\u306e\u958b\u767a\u73fe\u5834\u3067\u3088\u304f\u906d\u9047\u3059\u308b\u72b6\u6cc1\u306b\u57fa\u3065\u3044\u3066\u3044\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-104\">\n<p class=\"wp-block-paragraph\">\u30001. CSV\u30d5\u30a1\u30a4\u30eb\u51e6\u7406<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-105\">\n<p class=\"wp-block-paragraph\">\u3000\u3000\u25cf \u6587\u5b57\u30a8\u30f3\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u306e\u9069\u5207\u306a\u51e6\u7406<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-106\">\n<p class=\"wp-block-paragraph\">\u3000\u3000\u25cf \u30af\u30a9\u30fc\u30c6\u30fc\u30b7\u30e7\u30f3\u306e\u30a8\u30b9\u30b1\u30fc\u30d7<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-107\">\n<p class=\"wp-block-paragraph\">\u3000\u3000\u25cf \u5927\u898f\u6a21\u30d5\u30a1\u30a4\u30eb\u306e\u52b9\u7387\u7684\u306a\u51e6\u7406<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-108\">\n<p class=\"wp-block-paragraph\">\u30002. \u30ed\u30b0\u51e6\u7406<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-109\">\n<p class=\"wp-block-paragraph\">\u3000\u3000\u25cf \u6a5f\u5bc6\u60c5\u5831\u306e\u78ba\u5b9f\u306a\u4fdd\u8b77<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-110\">\n<p class=\"wp-block-paragraph\">\u3000\u3000\u25cf \u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3078\u306e\u914d\u616e<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-111\">\n<p class=\"wp-block-paragraph\">\u3000\u3000\u25cf \u9069\u5207\u306a\u30de\u30b9\u30ad\u30f3\u30b0\u30eb\u30fc\u30eb\u306e\u8a2d\u5b9a<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-112\">\n<p class=\"wp-block-paragraph\">\u30003. API\u51e6\u7406<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-113\">\n<p class=\"wp-block-paragraph\">\u3000\u3000\u25cf \u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u5bfe\u7b56\uff08XSS\u5bfe\u7b56\u7b49\uff09<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-114\">\n<p class=\"wp-block-paragraph\">\u3000\u3000\u25cf \u30ec\u30b9\u30dd\u30f3\u30b9\u306e\u6574\u5f62\u3068\u691c\u8a3c<\/p>\n<\/div>\n\n\n<p class=\"wp-block-paragraph\">\u3000\u3000\u25cf \u30a8\u30e9\u30fc\u30cf\u30f3\u30c9\u30ea\u30f3\u30b0<\/p>\n\n\n<div id=\"sgb-css-id-115\">\n<p class=\"wp-block-paragraph\">\u3053\u308c\u3089\u306e\u30e6\u30fc\u30b9\u30b1\u30fc\u30b9\u3092\u53c2\u8003\u306b\u3001\u5b9f\u969b\u306e\u958b\u767a\u3067\u306f\u72b6\u6cc1\u306b\u5fdc\u3058\u3066\u9069\u5207\u306a\u30a2\u30d7\u30ed\u30fc\u30c1\u3092\u9078\u629e\u3059\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-116\">\n<h2 class=\"wp-block-heading\" id=\"i-29\">\u307e\u3068\u3081\uff1a\u52b9\u679c\u7684\u306a\u6587\u5b57\u5217\u7f6e\u63db\u306e\u5b9f\u88c5\u306b\u5411\u3051\u3066<\/h2>\n<\/div>\n\n<div id=\"sgb-css-id-117\">\n<p class=\"wp-block-paragraph\">\u672c\u8a18\u4e8b\u3067\u89e3\u8aac\u3057\u305f\u5185\u5bb9\u3092\u5b9f\u8df5\u3059\u308b\u3053\u3068\u3067\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u52b9\u679c\u304c\u671f\u5f85\u3067\u304d\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-118\">\n<h4 class=\"wp-block-heading\" id=\"i-30\">1. \u57fa\u672c\u7684\u306a\u5b9f\u88c5\u30b9\u30ad\u30eb<\/h4>\n<\/div>\n\n<div id=\"sgb-css-id-119\">\n<p class=\"wp-block-paragraph\">\u3000\u25cf <code>replace()<\/code>\u3068<code>replaceAll()<\/code>\u306e\u9069\u5207\u306a\u4f7f\u3044\u5206\u3051<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-120\">\n<p class=\"wp-block-paragraph\">\u3000\u25cf \u6b63\u898f\u8868\u73fe\u3092\u6d3b\u7528\u3057\u305f\u52b9\u7387\u7684\u306a\u7f6e\u63db\u51e6\u7406<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-121\">\n<p class=\"wp-block-paragraph\">\u3000\u25cf \u6587\u5b57\u30a8\u30f3\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u3092\u8003\u616e\u3057\u305f\u5b89\u5168\u306a\u5b9f\u88c5<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-122\">\n<h4 class=\"wp-block-heading\" id=\"i-31\">2. \u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316<\/h4>\n<\/div>\n\n<div id=\"sgb-css-id-123\">\n<p class=\"wp-block-paragraph\">\u3000\u25cf StringBuilder\u3092\u4f7f\u7528\u3057\u305f\u52b9\u7387\u7684\u306a\u51e6\u7406<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-124\">\n<p class=\"wp-block-paragraph\">\u3000\u25cf \u5927\u898f\u6a21\u30c7\u30fc\u30bf\u51e6\u7406\u6642\u306e\u6700\u9069\u5316\u30c6\u30af\u30cb\u30c3\u30af<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-125\">\n<p class=\"wp-block-paragraph\">\u3000\u25cf \u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u306e\u524a\u6e1b\u65b9\u6cd5<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-126\">\n<h4 class=\"wp-block-heading\" id=\"i-32\">3. 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id=\"sgb-css-id-133\">\n<p class=\"wp-block-paragraph\">\u3000\u25cf Web API\u30ec\u30b9\u30dd\u30f3\u30b9\u306e\u52a0\u5de5<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-134\">\n<h4 class=\"wp-block-heading\" id=\"i-34\">\u6b21\u306e\u30b9\u30c6\u30c3\u30d7\uff1a\u3055\u3089\u306a\u308b\u5b66\u7fd2\u306b\u5411\u3051\u3066<\/h4>\n<\/div>\n\n<div id=\"sgb-css-id-135\">\n<p class=\"wp-block-paragraph\">\u6587\u5b57\u5217\u51e6\u7406\u306e\u57fa\u790e\u3092\u7406\u89e3\u3057\u305f\u3089\u3001\u6b21\u306e\u3088\u3046\u306a\u30c6\u30fc\u30de\u306b\u53d6\u308a\u7d44\u3080\u3053\u3068\u3092\u304a\u52e7\u3081\u3057\u307e\u3059\u3002<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-136\">\n<p class=\"wp-block-paragraph\">\u30001. \u6b63\u898f\u8868\u73fe\u306e\u3088\u308a\u6df1\u3044\u7406\u89e3<\/p>\n<\/div>\n\n<div id=\"sgb-css-id-137\">\n<p class=\"wp-block-paragraph\">\u30002. \u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u30c1\u30e5\u30fc\u30cb\u30f3\u30b0\u306e\u5b9f\u8df5<\/p>\n<\/div>\n\n<div 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