\u6b63\u5219\u8868\u8fbe\u5f0f\uff08regular expression\uff09\u662f\u4e00\u4e2a\u63cf\u8ff0\u5b57\u7b26\u6a21\u5f0f\u7684\u5bf9\u8c61\u3002JavaScript\u7684RegExp\u7c7b\u8868\u793a\u6b63\u5219\u8868\u8fbe\u5f0f\uff0cString\u548cRegExp\u90fd\u5b9a\u4e49\u4e86\u65b9\u6cd5\u3002<\/p>\n
1.1 \u6b63\u5219\u8868\u8fbe\u5f0f\u7684\u5b9a\u4e49<\/p>\n
\u6b63\u5219\u8868\u8fbe\u5f0f\u6709\u4e24\u79cd\u65b9\u6cd5\u5b9a\u4e49\uff1a<\/p>\n
\u4e00\u79cd\u662f\u4f7f\u7528\u6b63\u5219\u8868\u8fbe\u5f0f\u76f4\u63a5\u91cf\uff0c\u5c06\u5176\u5305\u542b\u5728\u4e00\u5bf9\u659c\u6760\uff08\/\uff09\u4e4b\u95f4\u7684\u5b57\u7b26\u3002
\nvar pattern = \/s$\/;
\n\u53e6\u4e00\u79cd\u662f\u4f7f\u7528RegExp()\u6784\u9020\u51fd\u6570\u3002
\nvar pattern = new RegExp(‘s’);
\n\u4e0a\u9762\u4e24\u79cd\u65b9\u6cd5\u662f\u7b49\u4ef7\u7684\uff0c\u7528\u6765\u5339\u914d\u6240\u6709\u4ee5\u5b57\u6bcd\u201cs\u201d\u7ed3\u5c3e\u7684\u5b57\u7b26\u4e32\u3002<\/p>\n
\u6b63\u5219\u8868\u8fbe\u5f0f\u7684\u6a21\u5f0f\u89c4\u5219\u662f\u7531\u4e00\u4e2a\u5b57\u7b26\u5e8f\u5217\u7ec4\u6210\u7684\uff0c\u6240\u6709\u5b57\u6bcd\u548c\u6570\u5b57\u90fd\u662f\u6309\u7167\u5b57\u9762\u542b\u4e49\u8fdb\u884c\u5339\u914d\u7684\u3002<\/p>\n
1.1.1 \u76f4\u63a5\u91cf\u5b57\u7b26<\/p>\n
JavaScript\u6b63\u5219\u8868\u8fbe\u5f0f\u8bed\u6cd5\u4e5f\u652f\u6301\u975e\u5b57\u6bcd\u7684\u5b57\u7b26\u5339\u914d\uff0c\u8fd9\u4e9b\u5b57\u7b26\u9700\u8981\u901a\u8fc7\u53cd\u659c\u6760\uff08\\\uff09\u4f5c\u4e3a\u524d\u7f00\u8fdb\u884c\u8f6c\u4e49\u3002
\n\u6709\u5982\u4e0b\u76f4\u63a5\u91cf\u5b57\u7b26\uff1a<\/p>\n
\\0 \u5339\u914dnull\u5b57\u7b26\uff08\\u0000\uff09\u3002
\n[\\b] \u5339\u914d\u9000\u683c\u952e(\\u0008)\uff0c\u4e0d\u8981\u4e0e\\b\u6df7\u6dc6\u3002
\n\\t \u5339\u914d\u5236\u8868\u7b26tab\uff08\\u0009\uff09\u3002
\n\\n \u5339\u914d\u6362\u884c\u952e(\\u000A)\u3002
\n\\v \u5339\u914d\u5782\u76f4\u5236\u8868\u7b26\uff08\\u000B\uff09\u3002
\n\\f \u5339\u914d\u6362\u9875\u7b26\uff08\\u000C\uff09\u3002
\n\\r \u5339\u914d\u56de\u8f66\u952e(\\u000D)\u3002
\n\\xnn \u5339\u914d\u4e00\u4e2a\u4ee5\u4e24\u4f4d\u5341\u516d\u8fdb\u5236\u6570\uff08\\x00-\\xFF\uff09\u8868\u793a\u7684\u5b57\u7b26\u3002
\n\\uxxx \u5339\u914d\u4e00\u4e2a\u4ee5\u56db\u4f4d\u5341\u516d\u8fdb\u5236\u6570\uff08\\u0000-\\uFFFF\uff09\u8868\u793a\u7684unicode\u5b57\u7b26\u3002
\n\\cX \u8868\u793aCtrl-[X]\uff0c\u5176\u4e2d\u7684X\u662fA-Z\u4e4b\u4e2d\u4efb\u4e00\u4e2a\u82f1\u6587\u5b57\u6bcd\uff0c\u7528\u6765\u5339\u914d\u63a7\u5236\u5b57\u7b26\u3002
\n1.1.2 \u5b57\u7b26\u7c7b<\/p>\n
\u5c06\u76f4\u63a5\u91cf\u5b57\u7b26\u5355\u72ec\u653e\u8fdb\u65b9\u62ec\u53f7\u5c31\u7ec4\u6210\u4e86\u5b57\u7b26\u7c7b\uff08character class\uff09\u3002\u4e00\u4e2a\u5b57\u7b26\u7c7b\u53ef\u4ee5\u5339\u914d\u5b83\u6240\u5305\u542b\u7684\u4efb\u610f\u5b57\u7b26\u3002\u6bd4\u5982\uff1a\/[abc]\/\u5c31\u548c\u5b57\u6bcd\u201ca\u201d\u3001\u201cb\u201d\u3001\u201cc\u201d\u4e2d\u7684\u4efb\u610f\u4e00\u4e2a\u90fd\u5339\u914d\u3002<\/p>\n
\u6211\u4eec\u8fd8\u53ef\u4ee5\u901a\u8fc7\u201c^\u201d\u7b26\u53f7\u6765\u5b9a\u4e49\u5426\u5b9a\u5b57\u7b26\u7c7b\uff0c\u5b83\u5339\u914d\u6240\u6709\u4e0d\u5305\u542b\u62ec\u53f7\u5185\u7684\u5b57\u7b26\u3002\u5b9a\u4e49\u5426\u5b9a\u5b57\u7b26\u7c7b\u65f6\uff0c\u5c06\u4e00\u4e2a\u201c^\u201d\u7b26\u53f7\u4f5c\u4e3a\u5de6\u65b9\u62ec\u53f7\u5185\u7684\u7b2c\u4e00\u4e2a\u5b57\u7b26\u3002\u6bd4\u5982\uff1a \/[^abc]\/ \u5339\u914d\u7684\u662f\u201ca\u201d\u3001\u201cb\u201d\u3001\u201cc\u201d\u4e4b\u5916\u7684\u6240\u6709\u5b57\u7b26\u3002\u2019<\/p>\n
\u5b57\u7b26\u7c7b\u8fd8\u53ef\u4ee5\u4f7f\u7528\u8fde\u5b57\u7b26\u6765\u8868\u793a\u5b57\u7b26\u8303\u56f4\u3002\u6bd4\u5982\u8981\u5339\u914d\u62c9\u4e01\u5b57\u6bcd\u8868\u4e2d\u7684\u5c0f\u5199\u5b57\u6bcd\uff0c\u53ef\u4ee5\u4f7f\u7528 \/[a-z]\/ \uff0c\u8981\u5339\u914d\u62c9\u4e01\u5b57\u6bcd\u8868\u4e2d\u7684\u4efb\u4f55\u5b57\u6bcd\u548c\u6570\u5b57\uff0c\u5219\u4f7f\u7528 \/[a-zA-Z0-9]\/ \u3002<\/p>\n
\u6ce8\u610f\uff1a\u5b57\u7b26\u7c7b\u7684\u8fde\u5b57\u7b26\u5fc5\u987b\u5728\u5934\u5c3e\u4e24\u4e2a\u5b57\u7b26\u4e2d\u95f4\uff0c\u624d\u6709\u7279\u6b8a\u542b\u4e49\uff0c\u5426\u5219\u5c31\u662f\u5b57\u9762\u542b\u4e49\u3002\u6bd4\u5982\uff0c[-9]\u5c31\u8868\u793a\u5339\u914d\u8fde\u5b57\u7b26\u548c9\uff0c\u800c\u4e0d\u662f\u5339\u914d0\u52309\u3002<\/p>\n
\u6b63\u5219\u8868\u8fbe\u5f0f\u7684\u5b57\u7b26\u7c7b\uff1a<\/p>\n
[…]\u00a0\u00a0\u65b9\u62ec\u53f7\u5185\u7684\u4efb\u610f\u5b57\u7b26
\n[^…]\u4e0d\u5728\u65b9\u62ec\u53f7\u5185\u7684\u4efb\u610f\u5b57\u7b26
\n.\u00a0 \u00a0\u9664\u6362\u884c\u7b26\u548c\u5176\u4ed6Unicode\u884c\u7ec8\u6b62\u7b26\u4e4b\u5916\u7684\u4efb\u610f\u5b57\u7b26
\n\\w\u00a0\u00a0\u4efb\u4f55ASCII\u5b57\u7b26\u7ec4\u6210\u7684\u5355\u8bcd\uff0c\u7b49\u4ef7\u4e8e[a-zA-Z0-9]\\W\u00a0\u00a0\u4efb\u4f55\u4e0d\u9002ASCII\u5b57\u7b26\u7ec4\u6210\u7684\u5355\u8bcd\uff0c\u7b49\u4ef7\u4e8e[^a-zA-Z0-9]\\s\u00a0\u00a0\u4efb\u4f55Unicode\u7a7a\u767d\u7b26
\n\\S\u00a0\u00a0\u4efb\u4f55\u975eUnicode\u7a7a\u767d\u7b26\u7684\u5b57\u7b26
\n\\d\u00a0\u00a0\u4efb\u4f55\u975eASCII\u6570\u5b57\uff0c\u7b49\u4ef7\u4e8e[0-9]\\D\u00a0\u00a0\u9664\u4e86ASCII\u6570\u5b57\u4e4b\u5916\u7684\u4efb\u4f55\u5b57\u7b26\uff0c\u7b49\u4ef7\u4e8e[^0-9][\\b]\u00a0\u00a0\u9000\u683c\u76f4\u63a5\u91cf
\n\u6ce8\u610f\uff1a\u5728\u65b9\u62ec\u53f7\u4e4b\u5185\u4e5f\u53ef\u4ee5\u5199\u4e0a\u9762\u8fd9\u4e9b\u7279\u6b8a\u8f6c\u4e49\u5b57\u7b26\u3002\u4f46\u6709\u4e00\u4e2a\u7279\u4f8b\uff1a\u5f53\u8f6c\u4e49\u7b26 \\b \u7528\u5728\u5b57\u7b26\u7c7b\u4e2d\u65f6\uff0c\u5b83\u8868\u793a\u7684\u662f\u9000\u683c\u7b26\uff0c\u6240\u4ee5\u8981\u5728\u6b63\u5219\u8868\u8fbe\u5f0f\u4e2d\u6309\u7167\u76f4\u63a5\u91cf\u8868\u793a\u4e00\u4e2a\u9000\u683c\u7b26\u65f6\uff0c\u53ea\u9700\u4f7f\u7528 \/[\\b]\/ \u5373\u53ef\u3002<\/p>\n
1.1.3 \u91cd\u590d<\/p>\n
\u5728\u6b63\u5219\u6a21\u5f0f\u4e4b\u540e\u8ddf\u968f\u7528\u4ee5\u6307\u5b9a\u5b57\u7b26\u91cd\u590d\u7684\u6807\u8bb0\u3002<\/p>\n
\u6b63\u5219\u8868\u8fbe\u5f0f\u7684\u91cd\u590d\u5b57\u7b26\u8bed\u6cd5\uff1a<\/p>\n
{n,m}\u00a0\u00a0\u5339\u914d\u524d\u4e00\u9879\u81f3\u5c11n\u6b21\uff0c\u81f3\u591am\u6b21
\n{n,}\u00a0 \u00a0\u5339\u914d\u524d\u4e00\u9879n\u6b21\u6216\u8005\u66f4\u591a\u6b21\uff0c\u4e5f\u53ef\u4ee5\u8bf4\u81f3\u5c11n\u6b21
\n{n}\u00a0 \u00a0 \u5339\u914d\u524d\u4e00\u9879n\u6b21
\n?\u00a0 \u00a0\u00a0 \u00a0\u5339\u914d\u524d\u4e00\u98790\u6b21\u6216\u80051\u6b21\uff0c\u7b49\u4ef7\u4e8e{0,1}
\n+\u00a0 \u00a0\u00a0 \u00a0\u5339\u914d\u524d\u4e00\u98791\u6b21\u6216\u591a\u6b21\uff0c\u7b49\u4ef7\u4e8e{1,}
\n*\u00a0 \u00a0\u00a0 \u00a0\u5339\u914d\u524d\u4e00\u98790\u6b21\u6216\u591a\u6b21\uff0c\u7b49\u4ef7\u4e8e{0,}
\n\u6ce8\u610f\uff1a\u5728\u4f7f\u7528\u201c\u201d\u548c\u201c?\u201d\u65f6\uff0c\u7531\u4e8e\u8fd9\u4e9b\u5b57\u7b26\u53ef\u80fd\u5339\u914d0\u4e2a\u5b57\u7b26\uff0c\u56e0\u6b64\u5b83\u4eec\u5141\u8bb8\u4ec0\u4e48\u90fd\u4e0d\u5339\u914d\u3002\u6bd4\u5982\uff1a\u6b63\u5219\u8868\u8fbe\u5f0f\/a\/\u5b9e\u9645\u4e0a\u4e0e\u5b57\u7b26\u4e32\u201cbbb\u201d\u5339\u914d\uff0c\u56e0\u4e3a\u8fd9\u4e2a\u5b57\u7b26\u4e32\u542b\u67090\u4e2aa\u3002<\/p>\n
1.1.4 \u975e\u8d2a\u5a6a\u7684\u91cd\u590d<\/p>\n
\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u5339\u914d\u91cd\u590d\u5b57\u7b26\u662f\u5c3d\u53ef\u80fd\u591a\u7684\u5339\u914d\uff0c\u800c\u4e14\u5141\u8bb8\u540e\u7eed\u7684\u6b63\u5219\u8868\u8fbe\u5f0f\u7ee7\u7eed\u5339\u914d\uff0c\u5373\u5339\u914d\u76f4\u5230\u4e0b\u4e00\u4e2a\u5b57\u7b26\u4e0d\u6ee1\u8db3\u5339\u914d\u89c4\u5219\u4e3a\u6b62\uff0c\u8fd9\u79f0\u4e3a\u201c\u8d2a\u5a6a\u7684\u201d\u5339\u914d\u3002<\/p>\n
\u5f53\u7136\uff0c\u6211\u4eec\u4e5f\u53ef\u4ee5\u4f7f\u7528\u6b63\u5219\u8868\u8fbe\u5f0f\u8fdb\u884c\u975e\u8d2a\u5a6a\u5339\u914d\uff0c\u4e00\u65e6\u6761\u4ef6\u6ee1\u8db3\uff0c\u5c31\u4e0d\u518d\u5f80\u4e0b\u5339\u914d\u3002\uff0c\u53ea\u987b\u5728\u5f85\u5339\u914d\u7684\u5b57\u7b26\u540e\u8ddf\u968f\u4e00\u4e2a\u95ee\u53f7\u5373\u53ef\uff1a\u201c??\u201d\u3001\u201c+?\u201d\u3001\u201c*?\u201d\u6216\u201c{1,5}?\u201d\u3002<\/p>\n
\/a+\/.exec(‘aaa’)\u00a0\u00a0\/\/[“aaa”]\/a+?\/.exec(‘aaa’)\u00a0\u00a0\/\/[“a”]1.1.5 \u9009\u62e9\u3001\u5206\u7ec4\u548c\u5f15\u7528<\/p>\n
\u6b63\u5219\u8868\u8fbe\u5f0f\u7684\u8bed\u6cd5\u8fd8\u5305\u62ec\u6307\u5b9a\u9009\u62e9\u9879\u3001\u5b50\u8868\u8fbe\u5f0f\u5206\u7ec4\u548c\u5f15\u7528\u524d\u4e00\u5b50\u8868\u8fbe\u5f0f\u7684\u7279\u6b8a\u5b57\u7b26\u3002<\/p>\n
\u5b57\u7b26\u201c|\u201d\u7528\u4e8e\u5206\u9694\u4f9b\u9009\u62e9\u7684\u5b57\u7b26\uff0c\u6bd4\u5982\uff1a\/ab|cd|ef\/\u53ef\u4ee5\u5339\u914d\u5b57\u7b26\u4e32\u201cab\u201d\uff0c\u4e5f\u53ef\u4ee5\u5339\u914d\u5b57\u7b26\u4e32\u201ccd\u201d\uff0c\u8fd8\u53ef\u4ee5\u5339\u914d\u5b57\u7b26\u4e32\u201cef\u201d\u3002<\/p>\n
\u6ce8\u610f\uff1a\u9009\u62e9\u9879\u7684\u5c1d\u8bd5\u5339\u914d\u6b21\u5e8f\u662f\u4ece\u5de6\u5230\u53f3\uff0c\u76f4\u5230\u53d1\u73b0\u4e86\u5339\u914d\u9879\u3002\u5982\u679c\u5de6\u8fb9\u7684\u9009\u62e9\u9879\u5339\u914d\uff0c\u5c31\u4f1a\u5ffd\u7565\u53f3\u8fb9\u7684\u5339\u914d\u9879\uff0c\u5373\u4f7f\u5b83\u4ea7\u751f\u66f4\u597d\u7684\u5339\u914d\u3002\u6bd4\u5982\uff1a\u5f53\u6b63\u5728\u8868\u8fbe\u5f0f\/a|ab\/\u5339\u914d\u5b57\u7b26\u4e32\u201cab\u201d\u65f6\uff0c\u5b83\u53ea\u80fd\u5339\u914d\u7b2c\u4e00\u4e2a\u5b57\u7b26\u3002<\/p>\n
\u5706\u62ec\u53f7\u201c()\u201d\u53ef\u4ee5\u628a\u5355\u72ec\u7684\u9879\u7ec4\u5408\u6210\u5b50\u8868\u8fbe\u5f0f\u3002<\/p>\n
\u5e26\u5706\u62ec\u53f7\u7684\u8868\u8fbe\u5f0f\u7684\u53e6\u4e00\u4e2a\u7528\u9014\u662f\u5141\u8bb8\u5728\u540c\u4e00\u6b63\u5219\u8868\u8fbe\u5f0f\u7684\u540e\u90e8\u5f15\u7528\u524d\u9762\u7684\u5b50\u8868\u8fbe\u5f0f\uff0c\u8fd9\u662f\u901a\u8fc7\u5728\u5b57\u7b26\u201c\\\u201d\u540e\u52a0\u4e00\u4f4d\u6216\u591a\u4f4d\u6570\u5b57\u6765\u5b9e\u73b0\u7684\uff0c\u8fd9\u4e2a\u6570\u5b57\u6307\u5b9a\u4e86\u5e26\u5706\u62ec\u53f7\u7684\u5b50\u8868\u8fbe\u5f0f\u5728\u6b63\u5219\u8868\u8fbe\u5f0f\u4e2d\u7684\u4f4d\u7f6e\u3002\u6bd4\u5982\uff1a\\1\u5f15\u7528\u7684\u662f\u7b2c\u4e00\u4e2a\u5e26\u5706\u62ec\u53f7\u7684\u5b50\u8868\u8fbe\u5f0f\uff0c\\3\u5f15\u7528\u7684\u662f\u7b2c\u4e09\u4e2a\u5e26\u5706\u62ec\u53f7\u7684\u5b50\u8868\u8fbe\u5f0f\u3002<\/p>\n
\/(.)b(.)\\1b\\2\/.test(‘abcabc’)\u00a0\u00a0\/\/true
\n\u4e0a\u9762\u7684\u4ee3\u7801\u4e2d\uff0c\\1\u8868\u793a\u7b2c\u4e00\u4e2a\u62ec\u53f7\u5339\u914d\u7684\u5185\u5bb9\uff0c\u5373\u7b2c\u4e00\u4e2a(.)\uff0c\u5339\u914d\u7684\u662f\u201ca\u201d\uff1b\\2\u8868\u793a\u7b2c\u4e8c\u4e2a\u62ec\u53f7(.)\uff0c\u5339\u914d\u7684\u662f\u201cb\u201d\u3002<\/p>\n
\u6ce8\u610f\uff1a\u56e0\u4e3a\u5b50\u8868\u8fbe\u5f0f\u53ef\u4ee5\u5d4c\u5957\u53e6\u4e00\u4e2a\u5b50\u8868\u8fbe\u5f0f\uff0c\u6240\u4ee5\u5f15\u7528\u7684\u4f4d\u7f6e\u662f\u53c2\u4e0e\u8ba1\u6570\u7684\u5de6\u62ec\u53f7\u7684\u4f4d\u7f6e\u3002\u6bd4\u5982\uff1a(s(ss))\uff0c\\2\u8868\u793a\u7684\u662f(ss)\u3002<\/p>\n
\u5bf9\u6b63\u5219\u8868\u8fbe\u5f0f\u4e2d\u524d\u4e00\u4e2a\u5b50\u8868\u8fbe\u5f0f\u7684\u5f15\u7528\uff0c\u5e76\u4e0d\u662f\u6307\u5bf9\u5b50\u8868\u8fbe\u5f0f\u6a21\u5f0f\u7684\u5f15\u7528\uff0c\u800c\u6307\u7684\u662f\u90a3\u4e2a\u6a21\u5f0f\u76f8\u5339\u914d\u7684\u6587\u672c\u7684\u5f15\u7528\u3002<\/p>\n
\/(a|b)c\\1\/.test(‘aca’)\u00a0\u00a0\/\/true
\n\/(a|b)c\\1\/.test(‘acb’)\u00a0\u00a0\/\/false
\n\u4e0a\u9762\u7684\u4ee3\u7801\u4e2d\uff0c\u7531\u4e8e(a|b)\u5339\u914d\u7684\u662fa\uff0c\u6240\u4ee5\\1\u6240\u5bf9\u5e94\u7684\u4e5f\u5e94\u8be5\u662fa\u3002<\/p>\n
\u6b63\u5219\u8868\u8fbe\u5f0f\u7684\u9009\u62e9\u3001\u5206\u7ec4\u548c\u5f15\u7528\u5b57\u7b26<\/p>\n
|\u00a0 \u00a0 \u9009\u62e9\uff0c\u5339\u914d\u7684\u662f\u8be5\u7b26\u53f7\u5de6\u8fb9\u7684\u5b50\u8868\u8fbe\u5f0f\u6216\u53f3\u8fb9\u7684\u5b50\u8868\u8fbe\u5f0f
\n(…)\u00a0 \u00a0 \u7ec4\u5408\uff0c\u5c06\u51e0\u4e2a\u9879\u7ec4\u5408\u4e3a\u4e00\u4e2a\u5355\u4f4d\uff0c\u8fd9\u4e2a\u5355\u4f4d\u53ef\u901a\u8fc7\u201c*\u201d\u3001\u201c+\u201d\u3001\u201c?\u201d\u548c\u201c|\u201d\u7b49\u7b26\u53f7\u52a0\u4ee5\u4fee\u9970\uff0c\u800c\u4e14\u53ef\u4ee5\u8bb0\u4f4f\u548c\u8fd9\u4e2a\u7ec4\u5408\u76f8\u5339\u914d\u7684\u5b57\u7b26\u4e32\u4ee5\u4f9b\u6b64\u540e\u7684\u5f15\u7528\u4f7f\u7528\u3002
\n(?…)\u00a0 \u00a0 \u53ea\u7ec4\u5408\uff0c\u628a\u9879\u7ec4\u5408\u5230\u4e00\u4e2a\u5355\u4f4d\uff0c\u4f46\u4e0d\u8bb0\u5fc6\u4e0e\u8be5\u7ec4\u76f8\u5339\u914d\u7684\u5b57\u7b26
\n\\n\u00a0 \u00a0 \u548c\u7b2cn\u4e2a\u5206\u7ec4\u7b2c\u4e00\u6b21\u5339\u914d\u7684\u5b57\u7b26\u76f8\u5339\u914d\uff0c\u7ec4\u662f\u5706\u62ec\u53f7\u4e2d\u7684\u5b50\u8868\u8fbe\u5f0f\uff08\u4e5f\u6709\u53ef\u80fd\u662f\u5d4c\u5957\u7684\uff09\uff0c\u7ec4\u7d22\u5f15\u662f\u4ece\u5de6\u5230\u53f3\u7684\u5de6\u62ec\u53f7\u6570\uff0c\u201c(?:\u201d\u5f62\u5f0f\u7684\u5206\u7ec4\u4e0d\u7f16\u7801
\n1.1.6 \u6307\u5b9a\u5339\u914d\u4f4d\u7f6e<\/p>\n
\u9664\u4e86\u5339\u914d\u5b57\u7b26\u4e32\u4e2d\u7684\u5b57\u7b26\u5916\uff0c\u6709\u4e9b\u6b63\u5219\u8868\u8fbe\u5f0f\u7684\u5143\u7d20\u5339\u914d\u7684\u662f\u5b57\u7b26\u4e4b\u95f4\u7684\u4f4d\u7f6e\uff0c\u4ea6\u53ef\u79f0\u4e3a\u6b63\u5219\u8868\u8fbe\u5f0f\u7684\u951a\u3002\u6bd4\u5982\uff1a\\b\u5339\u914d\u4e00\u4e2a\u5355\u8bcd\u7684\u8fb9\u754c\uff0c\u5373\u4f4d\u4e8e\\w\uff08ASCII\u5355\u8bcd\uff09\u5b57\u7b26\u548c\\W\uff08\u975eASCII\u5355\u8bcd\uff09\u4e4b\u95f4\u7684\u8fb9\u754c\uff0c\u6216\u4f4d\u4e8e\u4e00\u4e2aASCII\u5355\u8bcd\u4e0e\u5b57\u7b26\u4e32\u7684\u5f00\u59cb\u6216\u7ed3\u5c3e\u4e4b\u95f4\u7684\u8fb9\u754c\u3002<\/p>\n
\u6b63\u5219\u8868\u8fbe\u5f0f\u4e2d\u7684\u951a\u5b57\u7b26\uff1a<\/p>\n
^\u00a0 \u00a0 \u5339\u914d\u5b57\u7b26\u4e32\u7684\u5f00\u5934\uff0c\u5728\u591a\u884c\u68c0\u7d22\u4e2d\uff0c\u5339\u914d\u4e00\u884c\u7684\u5f00\u5934
\n$\u00a0 \u00a0 \u5339\u914d\u5b57\u7b26\u4e32\u7684\u7ed3\u5c3e\uff0c\u5728\u591a\u884c\u68c0\u7d22\u4e2d\uff0c\u5339\u914d\u4e00\u884c\u7684\u7ed3\u5c3e
\n\\b\u00a0 \u00a0\u5339\u914d\u4e00\u4e2a\u5355\u8bcd\u7684\u8fb9\u754c
\n\\B\u00a0 \u00a0\u5339\u914d\u975e\u5355\u8bcd\u8fb9\u754c\u7684\u4f4d\u7f6e
\n(?=p)\u00a0\u00a0\u96f6\u5bbd\u6b63\u5411\u5148\u884c\u65ad\u8a00\uff0c\u8981\u6c42\u63a5\u4e0b\u6765\u7684\u5b57\u7b26\u90fd\u4e0ep\u5339\u914d\uff0c\u4f46\u4e0d\u80fd\u5305\u62ec\u5339\u914dp\u7684\u90a3\u4e9b\u5b57\u7b26
\n(?!p)\u00a0\u00a0\u96f6\u5bbd\u8d1f\u5411\u5148\u884c\u65ad\u8a00\uff0c\u8981\u6c42\u63a5\u4e0b\u6765\u7684\u5b57\u7b26\u4e0d\u4e0ep\u5339\u914d
\n1.1.7 \u4fee\u9970\u7b26<\/p>\n
\u6b63\u5219\u8868\u8fbe\u5f0f\u7684\u4fee\u9970\u7b26\uff0c\u7528\u4ee5\u8bf4\u660e\u9ad8\u7ea7\u5339\u914d\u6a21\u5f0f\u7684\u89c4\u5219\u3002\u4fee\u9970\u7b26\u662f\u653e\u5728\u201c\/\u201d\u7b26\u53f7\u4e4b\u5916\u7684\uff0c\u4e5f\u5c31\u662f\u8bf4\uff0c\u5b83\u4eec\u4e0d\u662f\u51fa\u73b0\u5728\u4e24\u6761\u659c\u6760\u4e4b\u95f4\u7684\uff0c\u800c\u662f\u5728\u7b2c\u4e8c\u6761\u659c\u6760\u4e4b\u540e\u3002<\/p>\n
\u5728JavaScript\u4e2d\uff0c\u652f\u6301\u4e09\u4e2a\u4fee\u9970\u7b26\uff1a<\/p>\n
i \u6267\u884c\u4e0d\u533a\u5206\u5927\u5c0f\u5199\u7684\u5339\u914d
\ng \u6267\u884c\u4e00\u4e2a\u5168\u5c40\u5339\u914d\uff0c\u5373\u627e\u5230\u6240\u6709\u7684\u5339\u914d\uff0c\u800c\u4e0d\u662f\u5728\u627e\u5230\u7b2c\u4e00\u4e2a\u4e4b\u540e\u5c31\u505c\u6b62
\nm \u591a\u884c\u6a21\u5f0f\u5339\u914d\uff0c\u5728\u8fd9\u79cd\u6a21\u5f0f\u4e0b\uff0c\u5982\u679c\u5f85\u68c0\u7d22\u7684\u5b57\u7b26\u4e32\u5305\u542b\u591a\u884c\uff0c\u90a3\u4e48^\u548c$\u951a\u5b57\u7b26\u9664\u4e86\u5339\u914d\u6574\u4e2a\u5b57\u7b26\u4e32\u7684\u5f00\u59cb\u548c\u7ed3\u5c3e\u4e4b\u5916\uff0c\u8fd8\u80fd\u5339\u914d\u6bcf\u884c\u7684\u5f00\u59cb\u548c\u7ed3\u5c3e
\n\u8fd9\u4e9b\u4fee\u9970\u7b26\u53ef\u4ee5\u4efb\u610f\u7ec4\u5408\u3002\u6bd4\u5982\uff1a
\n\/test\/ig
\n1.2 \u7528\u4e8e\u6a21\u5f0f\u5339\u914d\u7684String\u65b9\u6cd5<\/p>\n
String\u652f\u63014\u79cd\u4f7f\u7528\u6b63\u5219\u8868\u8fbe\u5f0f\u7684\u65b9\u6cd5\u3002<\/p>\n
search()\uff1a\u6309\u7167\u7ed9\u5b9a\u7684\u6b63\u5219\u8868\u8fbe\u5f0f\u8fdb\u884c\u641c\u7d22\uff0c\u8fd4\u56de\u4e00\u4e2a\u6574\u6570\uff0c\u8868\u793a\u7b2c\u4e00\u4e2a\u4e0e\u4e4b\u5339\u914d\u7684\u5b57\u7b26\u4e32\u7684\u8d77\u59cb\u4f4d\u7f6e\uff0c\u5982\u679c\u627e\u4e0d\u5230\u5339\u914d\u7684\u5b50\u4e32\uff0c\u5c06\u8fd4\u56de-1\u3002
\nmatch()\uff1a\u8fd4\u56de\u4e00\u4e2a\u6570\u7ec4\uff0c\u6210\u5458\u662f\u6240\u6709\u5339\u914d\u7684\u5b50\u5b57\u7b26\u4e32\u3002
\nreplace()\uff1a\u6309\u7167\u7ed9\u5b9a\u7684\u6b63\u5219\u8868\u8fbe\u5f0f\u8fdb\u884c\u66ff\u6362\uff0c\u8fd4\u56de\u66ff\u6362\u540e\u7684\u5b57\u7b26\u4e32\u3002
\nsplit()\uff1a\u6309\u7167\u7ed9\u5b9a\u89c4\u5219\u8fdb\u884c\u5b57\u7b26\u4e32\u5206\u5272\uff0c\u8fd4\u56de\u4e00\u4e2a\u6570\u7ec4\uff0c\u5305\u542b\u5206\u5272\u540e\u7684\u5404\u4e2a\u6210\u5458\u3002
\n1.2.1 search()<\/p>\n
\u6309\u7167\u7ed9\u5b9a\u7684\u6b63\u5219\u8868\u8fbe\u5f0f\u8fdb\u884c\u641c\u7d22\uff0c\u8fd4\u56de\u4e00\u4e2a\u6574\u6570\uff0c\u8868\u793a\u7b2c\u4e00\u4e2a\u4e0e\u4e4b\u5339\u914d\u7684\u5b57\u7b26\u4e32\u7684\u8d77\u59cb\u4f4d\u7f6e\uff0c\u5982\u679c\u627e\u4e0d\u5230\u5339\u914d\u7684\u5b50\u4e32\uff0c\u5c06\u8fd4\u56de-1\u3002<\/p>\n
“javascript”.search(\/script\/i);
\n\u4e0a\u9762\u7684\u4ee3\u7801\u7684\u8fd4\u56de\u503c\u4e3a4<\/p>\n
\u5982\u679csearch()\u7684\u53c2\u6570\u4e0d\u662f\u6b63\u5219\u8868\u8fbe\u5f0f\uff0c\u5219\u9996\u5148\u4f1a\u901a\u8fc7RegExp\u6784\u9020\u51fd\u6570\u5c06\u5b83\u8f6c\u6362\u6210\u6b63\u5219\u8868\u8fbe\u5f0f\uff0csearch()\u65b9\u6cd5\u4e0d\u652f\u6301\u5168\u5c40\u68c0\u7d22\uff0c\u56e0\u4e3a\u5b83\u5ffd\u7565\u6b63\u5219\u8868\u8fbe\u5f0f\u53c2\u6570\u4e2d\u7684\u4fee\u9970\u7b26g\u3002<\/p>\n
1.2.2 match()<\/p>\n
match()\u65b9\u6cd5\u7684\u552f\u4e00\u53c2\u6570\u662f\u4e00\u4e2a\u6b63\u5219\u8868\u8fbe\u5f0f\uff0c\u8fd4\u56de\u7684\u662f\u4e00\u4e2a\u7531\u5339\u914d\u7ed3\u679c\u7ec4\u6210\u7684\u6570\u7ec4\u3002\u5982\u679c\u8be5\u6b63\u5219\u8868\u8fbe\u5f0f\u8bbe\u7f6e\u4e86\u4fee\u9970\u7b26g\uff0c\u5219\u8fd4\u56de\u7684\u6570\u7ec4\u5305\u542b\u5b57\u7b26\u4e32\u4e2d\u7684\u6240\u6709\u5339\u914d\u7ed3\u679c\u3002<\/p>\n
‘1 plus 2 equals 3′.match(\/\\d+\/g)\u00a0\u00a0\/\/\u8fd4\u56de[“1″,”2″,”3”]\u8fd4\u56de\u6765\u7684\u6570\u7ec4\u8fd8\u5e26\u6709\u53e6\u5916\u4e24\u4e2a\u5c5e\u6027\uff1aindex\u548cinput\uff0c\u5206\u522b\u8868\u793a\u5305\u542b\u53d1\u751f\u5339\u914d\u7684\u5b57\u7b26\u4f4d\u7f6e\u548c\u5f15\u7528\u7684\u6b63\u5728\u68c0\u7d22\u7684\u5b57\u7b26\u4e32\u3002<\/p>\n
1.2.3 replace()<\/p>\n
replace()\u65b9\u6cd5\u7528\u4ee5\u6267\u884c\u68c0\u7d22\u4e0e\u66ff\u6362\u64cd\u4f5c\u3002\u5176\u4e2d\u7b2c\u4e00\u4e2a\u53c2\u6570\u662f\u4e00\u4e2a\u6b63\u5219\u8868\u8fbe\u5f0f\uff0c\u7b2c\u4e8c\u4e2a\u53c2\u6570\u662f\u8981\u8fdb\u884c\u66ff\u6362\u7684\u5b57\u7b26\u4e32\u3002<\/p>\n
\u5982\u679creplace()\u7684\u7b2c\u4e00\u4e2a\u53c2\u6570\u662f\u5b57\u7b26\u4e32\u800c\u4e0d\u662f\u6b63\u5219\u8868\u8fbe\u5f0f\uff0c\u5219replace()\u5c06\u76f4\u63a5\u641c\u7d22\u8fd9\u4e2a\u5b57\u7b26\u4e32\uff0c\u800c\u4e0d\u4f1a\u50cfsearch()\u4e00\u6837\u9996\u5148\u901a\u8fc7RegExp()\u5c06\u5b83\u8f6c\u6362\u4e3a\u6b63\u5219\u8868\u8fbe\u5f0f\u3002<\/p>\n
replace\u65b9\u6cd5\u7684\u7b2c\u4e8c\u4e2a\u53c2\u6570\u53ef\u4ee5\u4f7f\u7528\u7f8e\u5143\u7b26\u53f7$\uff0c\u7528\u6765\u6307\u4ee3\u6240\u66ff\u6362\u7684\u5185\u5bb9\u3002
\n$& \u6307\u4ee3\u5339\u914d\u7684\u5b50\u5b57\u7b26\u4e32\u3002<\/p>\n
$` \u6307\u4ee3\u5339\u914d\u7ed3\u679c\u524d\u9762\u7684\u6587\u672c\u3002
\n$’ \u6307\u4ee3\u5339\u914d\u7ed3\u679c\u540e\u9762\u7684\u6587\u672c\u3002
\n$n \u6307\u4ee3\u5339\u914d\u6210\u529f\u7684\u7b2cn\u7ec4\u5185\u5bb9\uff0cn\u662f\u4ece1\u5f00\u59cb\u7684\u81ea\u7136\u6570\u3002
\n$$ \u6307\u4ee3\u7f8e\u5143\u7b26\u53f7$\u3002
\n\u6bd4\u5982\uff1a<\/p>\n
‘hello world’.replace(\/(\\w+)\\s(\\w+)\/, ‘$2 $1’)
\n\/\/ “world hello”
\nreplace\u65b9\u6cd5\u7684\u7b2c\u4e8c\u4e2a\u53c2\u6570\u8fd8\u53ef\u4ee5\u662f\u4e00\u4e2a\u51fd\u6570\uff0c\u5c06\u6bcf\u4e00\u4e2a\u5339\u914d\u5185\u5bb9\u66ff\u6362\u4e3a\u51fd\u6570\u8fd4\u56de\u503c\u3002<\/p>\n
‘abca’.replace(\/a\/g,function(match){
\nreturn match.toUpperCase();
\n});
\n\/\/ “AbcA”
\nreplace()\u65b9\u6cd5\u7684\u7b2c\u4e8c\u4e2a\u53c2\u6570\u53ef\u4ee5\u63a5\u53d7\u591a\u4e2a\u53c2\u6570\u3002\u7b2c\u4e00\u4e2a\u53c2\u6570\u662f\u6355\u6349\u5230\u7684\u5185\u5bb9\uff0c\u7b2c\u4e8c\u4e2a\u53c2\u6570\u662f\u6355\u6349\u5230\u7684\u7ec4\u5339\u914d\uff08\u6709\u591a\u5c11\u4e2a\u7ec4\u5339\u914d\uff0c\u5c31\u6709\u591a\u5c11\u4e2a\u5bf9\u5e94\u7684\u53c2\u6570\uff09\u3002<\/p>\n
1.2.4 split()<\/p>\n
split()\u65b9\u6cd5\u7528\u4ee5\u5c06\u8c03\u7528\u5b83\u7684\u5b57\u7b26\u4e32\u62c6\u5206\u4e3a\u4e00\u4e2a\u5b50\u4e32\u7ec4\u6210\u7684\u6570\u7ec4\u3002<\/p>\n
‘123,456,789’.split(‘,’)\u00a0\u00a0\/\/\u8fd4\u56de[“123″,”456″,”789”]split()\u65b9\u6cd5\u7684\u53c2\u6570\u4e5f\u53ef\u4ee5\u662f\u4e00\u4e2a\u6b63\u5219\u8868\u8fbe\u5f0f\u3002<\/p>\n
1.3 RegExp\u5bf9\u8c61<\/p>\n
RegExp()\u6784\u9020\u51fd\u6570\u5e26\u6709\u4e24\u4e2a\u5b57\u7b26\u4e32\u53c2\u6570\uff0c\u7b2c\u4e8c\u4e2a\u53c2\u6570\u662f\u53ef\u9009\u7684\uff0c\u5b83\u6307\u5b9a\u6b63\u5219\u8868\u8fbe\u5f0f\u7684\u4fee\u9970\u7b26\uff08\u53ef\u4f20\u5165\u4fee\u9970\u7b26g\u3001i\u3001m\u6216\u8005\u5b83\u4eec\u7684\u7ec4\u5408\uff09\uff1b\u7b2c\u4e00\u4e2a\u53c2\u6570\u5305\u542b\u6b63\u5219\u8868\u8fbe\u5f0f\u7684\u4e3b\u4f53\u90e8\u5206\uff0c\u4e5f\u5c31\u662f\u6b63\u5219\u8868\u8fbe\u5f0f\u76f4\u63a5\u91cf\u4e2d\u4e24\u6761\u659c\u7ebf\u4e4b\u95f4\u7684\u6587\u672c\u3002<\/p>\n
var regexp = new RegExp(‘\\\\d{5}’,’g’)
\n\u4e0a\u9762\u7684\u4ee3\u7801\u8868\u793a\u4f1a\u5168\u5c40\u7684\u67e5\u627e5\u4e2a\u6570\u5b57\u3002<\/p>\n
1.3.1 RegExp\u5bf9\u8c61\u7684\u5c5e\u6027<\/p>\n
\u6bcf\u4e2aRegExp\u5bf9\u8c61\u90fd\u5305\u542b5\u4e2a\u5c5e\u6027\uff1a<\/p>\n
source \u53ea\u8bfb\u5b57\u7b26\u4e32\uff0c\u5305\u542b\u6b63\u5219\u8868\u8fbe\u5f0f\u7684\u6587\u672c
\nglobal \u53ea\u8bfb\u5e03\u5c14\u503c\uff0c\u7528\u4ee5\u8bf4\u660e\u8fd9\u4e2a\u6b63\u5219\u8868\u8fbe\u5f0f\u662f\u5426\u5e26\u6709\u4fee\u9970\u7b26g
\nignoreCase \u53ea\u8bfb\u5e03\u5c14\u503c\uff0c\u7528\u4ee5\u8bf4\u660e\u6b63\u5219\u8868\u8fbe\u5f0f\u662f\u5426\u5e26\u6709\u4fee\u9970\u7b26i
\nmultiline \u53ea\u8bfb\u5e03\u5c14\u503c\uff0c\u7528\u4ee5\u8bf4\u660e\u6b63\u5219\u8868\u8fbe\u5f0f\u662f\u5426\u5e26\u6709\u4fee\u9970\u7b26m
\nlastIndex \u53ef\u8bfb\u5199\u7684\u6574\u6570\uff0c\u5982\u679c\u5339\u914d\u6a21\u5f0f\u5e26\u6709g\u4fee\u9970\u7b26\uff0c\u8fd9\u4e2a\u5c5e\u6027\u5b58\u50a8\u5728\u6574\u4e2a\u5b57\u7b26\u4e32\u4e2d\u4e0b\u4e00\u6b21\u68c0\u7d22\u7684\u5f00\u59cb\u4f4d\u7f6e\u3002
\n1.3.2 RegExp\u7684\u65b9\u6cd5<\/p>\n
RegExp\u5bf9\u8c61\u5b9a\u4e49\u4e86\u4e24\u4e2a\u7528\u4e8e\u6267\u884c\u6a21\u5f0f\u5339\u914d\u64cd\u4f5c\u7684\u65b9\u6cd5\u3002<\/p>\n
\uff081\uff09exec()<\/p>\n
\u6b63\u5219\u5bf9\u8c61\u7684exec\u65b9\u6cd5\uff0c\u53ef\u4ee5\u8fd4\u56de\u5339\u914d\u7ed3\u679c\u3002\u5982\u679c\u53d1\u73b0\u5339\u914d\uff0c\u5c31\u8fd4\u56de\u4e00\u4e2a\u6570\u7ec4\uff0c\u6210\u5458\u662f\u6bcf\u4e00\u4e2a\u5339\u914d\u6210\u529f\u7684\u5b50\u5b57\u7b26\u4e32\uff0c\u5426\u5219\u8fd4\u56denull\u3002<\/p>\n
\/a|b|c\/.exec(‘abc’)\u00a0\u00a0\/\/ [“a”]
\n\/a|b|c\/.exec(‘qwe’)\u00a0\u00a0\/\/ null
\n\uff082\uff09test()<\/p>\n
\u6b63\u5219\u5bf9\u8c61\u7684test\u65b9\u6cd5\u8fd4\u56de\u4e00\u4e2a\u5e03\u5c14\u503c\uff0c\u8868\u793a\u5f53\u524d\u6a21\u5f0f\u662f\u5426\u80fd\u5339\u914d\u53c2\u6570\u5b57\u7b26\u4e32\u3002<\/p>\n
var s = \/a\/g;
\nvar a = ‘baba’;
\ns.lastIndex\u00a0 \u00a0\/\/0
\ns.test(a);\u00a0 \u00a0\/\/true<\/p>\n
s.lastIndex;\u00a0 \u00a0\/\/2
\ns.test(a);\u00a0\u00a0\/\/true
\n\u6ce8\u610f\uff1a\u5982\u679c\u6b63\u5219\u8868\u8fbe\u5f0f\u5e26\u6709g\u4fee\u9970\u7b26\uff0c\u5219\u6bcf\u4e00\u6b21test\u65b9\u6cd5\u90fd\u4ece\u4e0a\u4e00\u6b21\u7ed3\u675f\u7684\u4f4d\u7f6e\u5f00\u59cb\u5411\u540e\u5339\u914d\uff0c\u4e5f\u53ef\u4ee5\u901a\u8fc7\u6b63\u5219\u5bf9\u8c61\u7684lastIndex\u5c5e\u6027\u6307\u5b9a\u5f00\u59cb\u641c\u7d22\u7684\u4f4d\u7f6e\u3002<\/p>\n
\u6b22\u8fce\u5206\u4eab\u672c\u6587\uff0c\u8f6c\u8f7d\u8bf7\u4fdd\u7559\u51fa\u5904\uff1a\u524d\u7aefABC<\/a> » JavaScript \u6b63\u5219\u8868\u8fbe\u5f0f<\/a><\/p>","protected":false},"excerpt":{"rendered":" \u6b63\u5219\u8868\u8fbe\u5f0f\uff08regular expression\uff09\u662f\u4e00\u4e2a\u63cf\u8ff0\u5b57\u7b26\u6a21\u5f0f\u7684\u5bf9\u8c61\u3002JavaScript\u7684RegExp\u7c7b\u8868\u793a\u6b63\u5219\u8868\u8fbe\u5f0f\uff0cString\u548cRegExp\u90fd\u5b9a\u4e49\u4e86\u65b9\u6cd5\u3002 1.1 \u6b63\u5219\u8868\u8fbe\u5f0f\u7684\u5b9a\u4e49 \u6b63\u5219 […]<\/p>\n","protected":false},"author":1,"featured_media":90,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[9,59],"_links":{"self":[{"href":"http:\/\/www.qdabc.cn\/index.php?rest_route=\/wp\/v2\/posts\/920"}],"collection":[{"href":"http:\/\/www.qdabc.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.qdabc.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.qdabc.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.qdabc.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=920"}],"version-history":[{"count":1,"href":"http:\/\/www.qdabc.cn\/index.php?rest_route=\/wp\/v2\/posts\/920\/revisions"}],"predecessor-version":[{"id":921,"href":"http:\/\/www.qdabc.cn\/index.php?rest_route=\/wp\/v2\/posts\/920\/revisions\/921"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/www.qdabc.cn\/index.php?rest_route=\/wp\/v2\/media\/90"}],"wp:attachment":[{"href":"http:\/\/www.qdabc.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=920"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.qdabc.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=920"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.qdabc.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=920"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}