{"id":1096,"date":"2023-02-02T16:37:16","date_gmt":"2023-02-02T07:37:16","guid":{"rendered":"http:\/\/attacktube.com\/?p=1096"},"modified":"2023-03-04T16:18:44","modified_gmt":"2023-03-04T07:18:44","slug":"%e3%80%90javascript%e3%80%91%e6%ad%a3%e8%a6%8f%e8%a1%a8%e7%8f%be%e3%81%ae%e8%82%af%e5%ae%9a%e5%85%88%e5%be%8c%e8%aa%ad%e3%81%bf%e3%81%a8%e5%90%a6%e5%ae%9a%e5%85%88%e5%be%8c%e8%aa%ad%e3%81%bf","status":"publish","type":"post","link":"https:\/\/attacktube.com\/?p=1096","title":{"rendered":"\u3010JavaScript\u3011\u6b63\u898f\u8868\u73fe\u306e\u80af\u5b9a\u5148(\u5f8c)\u8aad\u307f\u3068\u5426\u5b9a\u5148(\u5f8c)\u8aad\u307f"},"content":{"rendered":"\n<p>\u6b63\u898f\u8868\u73fe\u306e\u80af\u5b9a\u5148(\u5f8c)\u8aad\u307f\u3068\u5426\u5b9a\u5148(\u5f8c)\u8aad\u307f\u306f^(\u5148\u982d)\u3001$(\u672b\u5c3e)\u3001\\b(\u5358\u8a9e\u306e\u5883\u754c)\u540c\u69d8\u306b\u300c\u4f4d\u7f6e\u3078\u306e\u30de\u30c3\u30c1\u300d\u3067\u3042\u308b\u3002<br>\u3053\u306e\u300c\u4f4d\u7f6e\u3078\u306e\u30de\u30c3\u30c1\u300d\u306f\u30a2\u30f3\u30ab\u30fc\u3068\u547c\u3070\u308c\u308b\u3002<br>\u9577\u30550\u306e\u6587\u5b57\u5217\u306b\u30de\u30c3\u30c1\u3059\u308b\u3068\u8003\u3048\u3066\u3001\u30bc\u30ed\u5e45\u30a2\u30b5\u30fc\u30b7\u30e7\u30f3(zero-length assertion)\u3084\u30bc\u30ed\u5e45\u30de\u30c3\u30c1(zero-length match)\u3068\u3082\u547c\u3070\u308c\u308b\u3002<br><br>assertion(\u540d)\u300a\u30b3\u300b\u30a2\u30b5\u30fc\u30b7\u30e7\u30f3\u25c6\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u5f62\u5f0f\u691c\u8a3c\u306b\u304a\u3051\u308b\u6210\u7acb\u6761\u4ef6<\/p>\n\n\n\n<!--more-->\n\n\n\n<p>\u80af\u5b9a\u5148\u8aad\u307f(Positive <mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-red-color\">lookahead<\/mark>)<br>\u6587\u5b57\u5217\u300cJava\u300d\u306e\u5148\u306b\u6587\u5b57\u5217\u300cScript\u300d\u304c\u5b58\u5728\u3059\u308b\u5834\u5408\u306b\u9650\u308a\u3001\u6587\u5b57\u5217\u300cJava\u300d\u306b\u30de\u30c3\u30c1\u3059\u308b\u3002<br>\u3064\u307e\u308a\u3001\u6587\u5b57\u5217\u300cJava\u3007\u3007\u3007\u300d\u306e\u5834\u5408\u3001\u300cJava\u300d\u306e\u53f3\u5074\u306e\u300c\u3007\u3007\u3007\u300d\u304c\u300cScript\u300d\u306e\u5834\u5408\u306b\u9650\u308a\u3001<br>\u6587\u5b57\u5217\u300cJava\u300d\u306b\u30de\u30c3\u30c1\u3059\u308b\u3002<br><br>\u5426\u5b9a\u5148\u8aad\u307f(Negative <mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-red-color\">lookahead<\/mark>)<br>\u6587\u5b57\u5217\u300cJava\u300d\u306e\u5148\u306b\u6587\u5b57\u5217\u300cScript\u300d\u304c\u5b58\u5728\u3057\u306a\u3044\u5834\u5408\u306b\u9650\u308a\u3001\u6587\u5b57\u5217\u300cJava\u300d\u306b\u30de\u30c3\u30c1\u3059\u308b\u3002<br>\u3064\u307e\u308a\u3001\u6587\u5b57\u5217\u300cJava\u3007\u3007\u3007\u300d\u306e\u5834\u5408\u3001\u300cJava\u300d\u306e\u53f3\u5074\u306e\u300c\u3007\u3007\u3007\u300d\u304c\u300cScript\u300d\u3067\u306f\u306a\u3044\u5834\u5408\u306b\u9650\u308a<br>\u6587\u5b57\u5217\u300cJava\u300d\u306b\u30de\u30c3\u30c1\u3059\u308b\u3002<\/p>\n\n\n\n<p>\u80af\u5b9a\u5f8c\u8aad\u307f(Positive <mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\">lookbehind<\/mark>)<br>\u6587\u5b57\u5217\u300cScript\u300d\u306e\u5f8c\u308d\u306b\u6587\u5b57\u5217\u300cJava\u300d\u304c\u5b58\u5728\u3059\u308b\u5834\u5408\u306b\u9650\u308a\u3001\u6587\u5b57\u5217\u300cScript\u300d\u306b\u30de\u30c3\u30c1\u3059\u308b\u3002<br>\u3064\u307e\u308a\u3001\u6587\u5b57\u5217\u300c\u3007\u3007\u3007Script\u300d\u306e\u5834\u5408\u3001\u300cScript\u300d\u306e\u5de6\u5074\u306e\u300c\u3007\u3007\u3007\u300d\u304c\u300cJava\u300d\u306e\u5834\u5408\u306b\u9650\u308a\u3001<br>\u6587\u5b57\u5217\u300cScript\u300d\u306b\u30de\u30c3\u30c1\u3059\u308b\u3002<\/p>\n\n\n\n<p>\u5426\u5b9a\u5f8c\u8aad\u307f(Negative <mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\">lookbehind<\/mark>)<br>\u6587\u5b57\u5217\u300cScript\u300d\u306e\u5f8c\u308d\u306b\u6587\u5b57\u5217\u300cJava\u300d\u304c\u5b58\u5728\u3057\u306a\u3044\u5834\u5408\u306b\u9650\u308a\u3001\u6587\u5b57\u5217\u300cScript\u300d\u306b\u30de\u30c3\u30c1\u3059\u308b\u3002<br>\u3064\u307e\u308a\u3001\u6587\u5b57\u5217\u300c\u3007\u3007\u3007Script\u300d\u306e\u5834\u5408\u3001\u300cScript\u300d\u306e\u5de6\u5074\u306e\u300c\u3007\u3007\u3007\u300d\u304c\u300cJava\u300d\u3067\u306f\u306a\u3044\u5834\u5408\u306b\u9650\u308a\u3001\u6587\u5b57\u5217\u300cScript\u300d\u306b\u30de\u30c3\u30c1\u3059\u308b\u3002<br><br>\u203b\u300c\u5148\u8aad\u307f\u300d\u306e\u300c\u5148\u300d\u306f\u300c\u3053\u306e\u3042\u3068\u306b\u7d9a\u304f\u90e8\u5206\u300d\u3068\u3044\u3046\u610f\u5473\u3067\u4f7f\u7528\u3057\u3066\u3044\u308b\u3002<br>\u300e\u300c\u5148\u8aad\u307f\u300d\u306e\u5bfe\u7fa9\u8a9e\u306f\u300c\u5f8c\u8aad\u307f\u300d\u3067\u306f\u306a\u3044\u306e\u3067\u306f\uff1f\u300f\u3068\u3044\u3046\u610f\u898b\u304c\u30cd\u30c3\u30c8\u306b\u3042\u3063\u305f\u3002<br><a href=\"https:\/\/www.php.net\/manual\/ja\/regexp.reference.assertions.php\">PHP: \u8a00\u660e &#8211; Manual<\/a> ExternalLink \u3067\u306f\u300c\u623b\u308a\u8aad\u307f\u300d\u3068\u8a33\u3055\u308c\u3066\u3044\u308b\u3002<br>\u79c1\u306f\u8a33\u3055\u305a\u306b\u300c\u5148\u8aad\u307f\u300d\u3092\u300c <mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-red-color\">lookahead<\/mark>\u300d\u3001\u300c\u5f8c\u8aad\u307f\u300d\u3092\u300c<mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\">lookbehind<\/mark>\u300d\u3068\u82f1\u8a9e\u3067\u8a00\u3063\u305f\u65b9\u304c\u826f\u3044\u3068\u601d\u3046\u3002<br>\u300c\u5148\u8aad\u307f\u300d\u3001\u300c\u5f8c\u8aad\u307f\u300d\u306f\u307e\u3068\u3081\u3066 \u300clookaround\u300d\u3068\u547c\u3070\u308c\u308b\u3002<br><br>\u300c\u80af\u5b9a\u5148(\u5f8c)\u8aad\u307f\u300d\u3001\u300c\u5426\u5b9a\u5148(\u5f8c)\u8aad\u307f\u300d\u306f\u62ec\u5f27\u5185\u306b\u30de\u30c3\u30c1\u3057\u305f\u3068\u304d\u306b\u3001\u30c6\u30ad\u30b9\u30c8\u306e\u64cd\u4f5c\u4f4d\u7f6e\u304c\u958b\u59cb\u4f4d\u7f6e\u306b\u5dfb\u304d\u623b\u3055\u308c\u3066\u4e8b\u5b9f\u4e0a\u4f55\u3082\u30de\u30c3\u30c1\u3057\u306a\u3053\u3068\u3092\u9664\u3051\u3070\u3001\u975e\u30ad\u30e3\u30d7\u30c1\u30e3\u30fc\u30b0\u30eb\u30fc\u30d7\u3068\u540c\u3058\u306b\u306a\u308b\u3002<br>\u300c\u80af\u5b9a\u5148(\u5f8c)\u8aad\u307f\u300d\u3001\u300c\u5426\u5b9a\u5148(\u5f8c)\u8aad\u307f\u300d\u306f\u4f4d\u7f6e\u3078\u306e\u30de\u30c3\u30c1\u3068\u306a\u308b\u3002<br><br>\u80af\u5b9a\u5148(\u5f8c)\u8aad\u307f\u3068\u5426\u5b9a\u5148(\u5f8c)\u8aad\u307f\u306e\u4f8b\u3092\u6b21\u306b\u793a\u3059<\/p>\n\n\n\n<br>\n<script async=\"\" src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-3461056110605997\" crossorigin=\"anonymous\"><\/script>\n<ins class=\"adsbygoogle\" style=\"display:block; text-align:center;\" data-ad-layout=\"in-article\" data-ad-format=\"fluid\" data-ad-client=\"ca-pub-3461056110605997\" data-ad-slot=\"3137443461\"><\/ins>\n<script>\n     (adsbygoogle = window.adsbygoogle || []).push({});\n<\/script>\n<br>\n\n\n\n<pre><code>\nlet regex;\n\nconsole.log(\"-----\");\n\nconsole.log(\"1:\u80af\u5b9a\u5148\u8aad\u307f\/Java(?=Script)\/\");\n\nregex = \/Java(?=Script)\/;\n\nconsole.log(\"Java:\"+regex.test(\"Java\"));\nconsole.log(\"Script:\"+regex.test(\"Script\"));\nconsole.log(\"JavaScript:\"+regex.test(\"JavaScript\"));\nconsole.log(\"TypeScript:\"+regex.test(\"TypeScript\"));\nconsole.log(\"JavaWorld:\"+regex.test(\"JavaWorld\"));\n\nconsole.log(\"2:\u5426\u5b9a\u5148\u8aad\u307f\/Java(?!Script)\/\");\n\nregex = \/Java(?!Script)\/;\n\nconsole.log(\"Java:\"+regex.test(\"Java\"));\nconsole.log(\"Script:\"+regex.test(\"Script\"));\nconsole.log(\"JavaScript:\"+regex.test(\"JavaScript\"));\nconsole.log(\"TypeScript:\"+regex.test(\"TypeScript\"));\nconsole.log(\"JavaWorld:\"+regex.test(\"JavaWorld\"));\n\nconsole.log(\"3:\u80af\u5b9a\u5f8c\u8aad\u307f\/(?&lt;=Java)Script\/\");\n\nregex = \/(?&lt;=Java)Script\/;\n\nconsole.log(\"Java:\"+regex.test(\"Java\"));\nconsole.log(\"Script:\"+regex.test(\"Script\"));\nconsole.log(\"JavaScript:\"+regex.test(\"JavaScript\"));\nconsole.log(\"TypeScript:\"+regex.test(\"TypeScript\"));\nconsole.log(\"JavaWorld:\"+regex.test(\"JavaWorld\"));\n\nconsole.log(\"4:\u5426\u5b9a\u5f8c\u8aad\u307f\/(?&lt;!Java)Script\/\");\n\nregex = \/(?&lt;!Java)Script\/;\n\nconsole.log(\"Java:\"+regex.test(\"Java\"));\nconsole.log(\"Script:\"+regex.test(\"Script\"));\nconsole.log(\"JavaScript:\"+regex.test(\"JavaScript\"));\nconsole.log(\"TypeScript:\"+regex.test(\"TypeScript\"));\nconsole.log(\"JavaWorld:\"+regex.test(\"JavaWorld\"));\n\nconsole.log(\"-----\");\n\n\/*\n\n-----\n1:\u80af\u5b9a\u5148\u8aad\u307f\/Java(?=Script)\/\nJava:false\nScript:false\nJavaScript:true\nTypeScript:false\nJavaWorld:false\n2:\u5426\u5b9a\u5148\u8aad\u307f\/Java(?!Script)\/\nJava:true\nScript:false\nJavaScript:false\nTypeScript:false\nJavaWorld:true\n3:\u80af\u5b9a\u5f8c\u8aad\u307f\/(?&lt;=Java)Script\/\nJava:false\nScript:false\nJavaScript:true\nTypeScript:false\nJavaWorld:false\n4:\u5426\u5b9a\u5f8c\u8aad\u307f\/(?&lt;!Java)Script\/\nJava:false\nScript:true\nJavaScript:false\nTypeScript:true\nJavaWorld:false\n-----\n\n*\/\n\n<\/code><\/pre>\n\n\n\n<p>\u53c2\u8003<br><a href=\"https:\/\/zenn.dev\/usamik26\/articles\/regex-lookahead\">\u6b63\u898f\u8868\u73fe\u306e\u5148\u8aad\u307f\u30fb\u5f8c\u8aad\u307f (zenn.dev)<\/a> ExternalLink<br><a href=\"https:\/\/gihyo.jp\/dev\/serial\/01\/perl-hackers-hub\/005803\">\u7b2c58\u56de\u3000\u6b63\u898f\u8868\u73fe\u306e\u52d8\u6240\u2015\u308f\u304b\u308a\u3065\u3089\u3044\u8a18\u6cd5\u306e\u899a\u3048\u65b9\u3001\u5148\u8aad\u307f\u3084\u5f8c\u8aad\u307f\u306e\u5b9f\u8df5\uff083\uff09 | gihyo.jp<\/a> ExternalLink<br><a href=\"https:\/\/ja.javascript.info\/regexp-lookahead-lookbehind\">\u5148\u8aad\u307f\u3068\u5f8c\u8aad\u307f(Lookahead\/lookbehind) (javascript.info)<\/a> ExternalLink<\/p>\n\n\n\n<script type=\"text\/javascript\">\njQuery(function($){\n$(\".jp-video\").hide();\n});\n<\/script>\n","protected":false},"excerpt":{"rendered":"<p>\u6b63\u898f\u8868\u73fe\u306e\u80af\u5b9a\u5148(\u5f8c)\u8aad\u307f\u3068\u5426\u5b9a\u5148(\u5f8c)\u8aad\u307f\u306f^(\u5148\u982d)\u3001$(\u672b\u5c3e)\u3001\\b(\u5358\u8a9e\u306e\u5883\u754c)\u540c\u69d8\u306b\u300c\u4f4d\u7f6e\u3078\u306e\u30de\u30c3\u30c1\u300d\u3067\u3042\u308b\u3002\u3053\u306e\u300c\u4f4d\u7f6e\u3078\u306e\u30de\u30c3\u30c1\u300d\u306f\u30a2\u30f3\u30ab\u30fc\u3068\u547c\u3070\u308c\u308b\u3002\u9577\u30550\u306e\u6587\u5b57\u5217\u306b\u30de\u30c3\u30c1\u3059\u308b\u3068\u8003\u3048\u3066\u3001\u30bc\u30ed\u5e45\u30a2\u30b5\u30fc\u30b7\u30e7\u30f3( [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[3],"tags":[],"class_list":["post-1096","post","type-post","status-publish","format-standard","hentry","category-javascript"],"jetpack_featured_media_url":"","jetpack-related-posts":[],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/attacktube.com\/index.php?rest_route=\/wp\/v2\/posts\/1096","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/attacktube.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/attacktube.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/attacktube.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/attacktube.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1096"}],"version-history":[{"count":15,"href":"https:\/\/attacktube.com\/index.php?rest_route=\/wp\/v2\/posts\/1096\/revisions"}],"predecessor-version":[{"id":1411,"href":"https:\/\/attacktube.com\/index.php?rest_route=\/wp\/v2\/posts\/1096\/revisions\/1411"}],"wp:attachment":[{"href":"https:\/\/attacktube.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1096"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/attacktube.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1096"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/attacktube.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1096"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}