\u524d\u8a00\uff1a
\n\u534a\u5e74\u524d\u6211\u5bf9\u6b63\u5219\u8868\u8fbe\u5f0f\u4ea7\u751f\u4e86\u5174\u8da3\uff0c\u5728\u7f51\u4e0a\u67e5\u627e\u8fc7\u4e0d\u5c11\u8d44\u6599\uff0c\u770b\u8fc7\u4e0d\u5c11\u7684\u6559\u7a0b\uff0c\u6700\u540e\u5728\u4f7f\u7528\u4e00\u4e2a\u6b63\u5219\u8868\u8fbe\u5f0f\u5de5\u5177RegexBuddy\u65f6\u53d1\u73b0\u4ed6\u7684\u6559\u7a0b\u5199\u7684\u975e\u5e38\u597d\uff0c\u53ef\u4ee5\u8bf4\u662f\u6211\u76ee\u524d\u89c1\u8fc7\u6700\u597d\u7684\u6b63\u5219\u8868\u8fbe\u5f0f\u6559\u7a0b\u3002\u4e8e\u662f\u4e00\u76f4\u60f3\u628a\u4ed6\u7ffb\u8bd1\u8fc7\u6765\u3002\u8fd9\u4e2a\u613f\u671b\u76f4\u5230\u8fd9\u4e2a\u4e94\u4e00\u957f\u5047\u624d\u5f97\u4ee5\u5b9e\u73b0\uff0c\u7ed3\u679c\u5c31\u6709\u4e86\u8fd9\u7bc7\u6587\u7ae0\u3002\u5173\u4e8e\u672c\u6587\u7684\u540d\u5b57\uff0c\u4f7f\u7528\u201c\u6df1\u5165\u6d45\u51fa\u201d\u4f3c\u4e4e\u5df2\u7ecf\u592a\u4fd7\u3002\u4f46\u662f\u901a\u8bfb\u539f\u6587\u4ee5\u540e\uff0c\u89c9\u5f97\u53ea\u6709\u7528\u201c\u6df1\u5165\u6d45\u51fa\u201d\u624d\u80fd\u51c6\u786e\u7684\u8868\u8fbe\u51fa\u8be5\u6559\u7a0b\u7ed9\u6211\u7684\u611f\u53d7\uff0c\u6240\u4ee5\u4e5f\u5c31\u4e0d\u80fd\u514d\u4fd7\u4e86\u3002
\n\u672c\u6587\u662fJan Goyvaerts\u4e3aRegexBuddy\u5199\u7684\u6559\u7a0b\u7684\u8bd1\u6587\uff0c\u7248\u6743\u5f52\u539f\u4f5c\u8005\u6240\u6709\uff0c\u6b22\u8fce\u8f6c\u8f7d\u3002\u4f46\u662f\u4e3a\u4e86\u5c0a\u91cd\u539f\u4f5c\u8005\u548c\u8bd1\u8005\u7684\u52b3\u52a8\uff0c\u8bf7\u6ce8\u660e\u51fa\u5904\uff01\u8c22\u8c22\uff01<\/p>\n
\u00a0<\/strong><\/p>\n \u57fa\u672c\u8bf4\u6765\uff0c\u6b63\u5219\u8868\u8fbe\u5f0f\u662f\u4e00\u79cd\u7528\u6765\u63cf\u8ff0\u4e00\u5b9a\u6570\u91cf\u6587\u672c\u7684\u6a21\u5f0f\u3002Regex\u4ee3\u8868Regular Express\u3002\u672c\u6587\u5c06\u7528<<regex>>\u6765\u8868\u793a\u4e00\u6bb5\u5177\u4f53\u7684\u6b63\u5219\u8868\u8fbe\u5f0f\u3002<\/p>\n \u4e00\u6bb5\u6587\u672c\u5c31\u662f\u6700\u57fa\u672c\u7684\u6a21\u5f0f\uff0c\u7b80\u5355\u7684\u5339\u914d\u76f8\u540c\u7684\u6587\u672c\u3002<\/p>\n <\/p>\n \u6b63\u5219\u8868\u8fbe\u5f0f\u5f15\u64ce\u662f\u4e00\u79cd\u53ef\u4ee5\u5904\u7406\u6b63\u5219\u8868\u8fbe\u5f0f\u7684\u8f6f\u4ef6\u3002\u901a\u5e38\uff0c\u5f15\u64ce\u662f\u66f4\u5927\u7684\u5e94\u7528\u7a0b\u5e8f\u7684\u4e00\u90e8\u5206\u3002\u5728\u8f6f\u4ef6\u4e16\u754c\uff0c\u4e0d\u540c\u7684\u6b63\u5219\u8868\u8fbe\u5f0f\u5e76\u4e0d\u4e92\u76f8\u517c\u5bb9\u3002\u672c\u6559\u7a0b\u4f1a\u96c6\u4e2d\u8ba8\u8bbaPerl 5 \u7c7b\u578b\u7684\u5f15\u64ce\uff0c\u56e0\u4e3a\u8fd9\u79cd\u5f15\u64ce\u662f\u5e94\u7528\u6700\u5e7f\u6cdb\u7684\u5f15\u64ce\u3002\u540c\u65f6\u6211\u4eec\u4e5f\u4f1a\u63d0\u5230\u4e00\u4e9b\u548c\u5176\u4ed6\u5f15\u64ce\u7684\u533a\u522b\u3002\u8bb8\u591a\u8fd1\u4ee3\u7684\u5f15\u64ce\u90fd\u5f88\u7c7b\u4f3c\uff0c\u4f46\u4e0d\u5b8c\u5168\u4e00\u6837\u3002\u4f8b\u5982.NET\u6b63\u5219\u5e93\uff0cJDK\u6b63\u5219\u5305\u3002<\/p>\n <\/p>\n \u6700\u57fa\u672c\u7684\u6b63\u5219\u8868\u8fbe\u5f0f\u7531\u5355\u4e2a\u6587\u5b57\u7b26\u53f7\u7ec4\u6210\u3002\u5982<<a>>\uff0c\u5b83\u5c06\u5339\u914d\u5b57\u7b26\u4e32\u4e2d\u7b2c\u4e00\u6b21\u51fa\u73b0\u7684\u5b57\u7b26\u201ca\u201d\u3002\u5982\u5bf9\u5b57\u7b26\u4e32\u201cJack is a boy\u201d\u3002\u201cJ\u201d\u540e\u7684\u201ca\u201d\u5c06\u88ab\u5339\u914d\u3002\u800c\u7b2c\u4e8c\u4e2a\u201ca\u201d\u5c06\u4e0d\u4f1a\u88ab\u5339\u914d\u3002<\/p>\n \u6b63\u5219\u8868\u8fbe\u5f0f\u4e5f\u53ef\u4ee5\u5339\u914d\u7b2c\u4e8c\u4e2a\u201ca\u201d\uff0c\u8fd9\u5fc5\u987b\u662f\u4f60\u544a\u8bc9\u6b63\u5219\u8868\u8fbe\u5f0f\u5f15\u64ce\u4ece\u7b2c\u4e00\u6b21\u5339\u914d\u7684\u5730\u65b9\u5f00\u59cb\u641c\u7d22\u3002\u5728\u6587\u672c\u7f16\u8f91\u5668\u4e2d\uff0c\u4f60\u53ef\u4ee5\u4f7f\u7528\u201c\u67e5\u627e\u4e0b\u4e00\u4e2a\u201d\u3002\u5728\u7f16\u7a0b\u8bed\u8a00\u4e2d\uff0c\u4f1a\u6709\u4e00\u4e2a\u51fd\u6570\u53ef\u4ee5\u4f7f\u4f60\u4ece\u524d\u4e00\u6b21\u5339\u914d\u7684\u4f4d\u7f6e\u5f00\u59cb\u7ee7\u7eed\u5411\u540e\u641c\u7d22\u3002<\/p>\n \u7c7b\u4f3c\u7684\uff0c<<cat>>\u4f1a\u5339\u914d\u201cAbout cats and dogs\u201d\u4e2d\u7684\u201ccat\u201d\u3002\u8fd9\u7b49\u4e8e\u662f\u544a\u8bc9\u6b63\u5219\u8868\u8fbe\u5f0f\u5f15\u64ce\uff0c\u627e\u5230\u4e00\u4e2a<<c>>\uff0c\u7d27\u8ddf\u4e00\u4e2a<<a>>\uff0c\u518d\u8ddf\u4e00\u4e2a<<t>>\u3002<\/p>\n \u8981\u6ce8\u610f\uff0c\u6b63\u5219\u8868\u8fbe\u5f0f\u5f15\u64ce\u7f3a\u7701\u662f\u5927\u5c0f\u5199\u654f\u611f\u7684\u3002\u9664\u975e\u4f60\u544a\u8bc9\u5f15\u64ce\u5ffd\u7565\u5927\u5c0f\u5199\uff0c\u5426\u5219<<cat>>\u4e0d\u4f1a\u5339\u914d\u201cCat\u201d\u3002<\/p>\n <\/p>\n \u5bf9\u4e8e\u6587\u5b57\u5b57\u7b26\uff0c\u670912\u4e2a\u5b57\u7b26\u88ab\u4fdd\u7559\u4f5c\u7279\u6b8a\u7528\u9014\u3002\u4ed6\u4eec\u662f\uff1a<\/p>\n [ ] \\ ^ $ . | ? * + ( )<\/p>\n \u8fd9\u4e9b\u7279\u6b8a\u5b57\u7b26\u4e5f\u88ab\u79f0\u4f5c\u5143\u5b57\u7b26\u3002<\/p>\n \u5982\u679c\u4f60\u60f3\u5728\u6b63\u5219\u8868\u8fbe\u5f0f\u4e2d\u5c06\u8fd9\u4e9b\u5b57\u7b26\u7528\u4f5c\u6587\u672c\u5b57\u7b26\uff0c\u4f60\u9700\u8981\u7528\u53cd\u659c\u6760\u201c\\\u201d\u5bf9\u5176\u8fdb\u884c\u6362\u7801 (escape)\u3002\u4f8b\u5982\u4f60\u60f3\u5339\u914d\u201c1+1=2\u201d\uff0c\u6b63\u786e\u7684\u8868\u8fbe\u5f0f\u4e3a<<1\\+1=2>>.<\/p>\n \u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c<<1+1=2>>\u4e5f\u662f\u6709\u6548\u7684\u6b63\u5219\u8868\u8fbe\u5f0f\u3002\u4f46\u5b83\u4e0d\u4f1a\u5339\u914d\u201c1+1=2\u201d\uff0c\u800c\u4f1a\u5339\u914d\u201c123+111=234\u201d\u4e2d\u7684\u201c111=2\u201d\u3002\u56e0\u4e3a\u201c+\u201d\u5728\u8fd9\u91cc\u8868\u793a\u7279\u6b8a\u542b\u4e49\uff08\u91cd\u590d1\u6b21\u5230\u591a\u6b21\uff09\u3002<\/p>\n \u5728\u7f16\u7a0b\u8bed\u8a00\u4e2d\uff0c\u8981\u6ce8\u610f\uff0c\u4e00\u4e9b\u7279\u6b8a\u7684\u5b57\u7b26\u4f1a\u5148\u88ab\u7f16\u8bd1\u5668\u5904\u7406\uff0c\u7136\u540e\u518d\u4f20\u9012\u7ed9\u6b63\u5219\u5f15\u64ce\u3002\u56e0\u6b64\u6b63\u5219\u8868\u8fbe\u5f0f<<1\\+2=2>>\u5728C++\u4e2d\u8981\u5199\u6210\u201c1\\\\+1=2\u201d\u3002\u4e3a\u4e86\u5339\u914d\u201cC:\\temp\u201d\uff0c\u4f60\u8981\u7528\u6b63\u5219\u8868\u8fbe\u5f0f<<C:\\\\temp>>\u3002\u800c\u5728C++\u4e2d\uff0c\u6b63\u5219\u8868\u8fbe\u5f0f\u5219\u53d8\u6210\u4e86\u201cC:\\\\\\\\temp\u201d\u3002<\/p>\n <\/p>\n \u53ef\u4ee5\u4f7f\u7528\u7279\u6b8a\u5b57\u7b26\u5e8f\u5217\u6765\u4ee3\u8868\u67d0\u4e9b\u4e0d\u53ef\u663e\u793a\u5b57\u7b26\uff1a<\/p>\n <<\\t>>\u4ee3\u8868Tab(0x09)<\/p>\n <<\\r>>\u4ee3\u8868\u56de\u8f66\u7b26(0x0D)<\/p>\n <<\\n>>\u4ee3\u8868\u6362\u884c\u7b26(0x0A)<\/p>\n \u8981\u6ce8\u610f\u7684\u662fWindows\u4e2d\u6587\u672c\u6587\u4ef6\u4f7f\u7528\u201c\\r\\n\u201d\u6765\u7ed3\u675f\u4e00\u884c\u800cUnix\u4f7f\u7528\u201c\\n\u201d\u3002<\/p>\n <\/p>\n \u77e5\u9053\u6b63\u5219\u8868\u8fbe\u5f0f\u5f15\u64ce\u662f\u5982\u4f55\u5de5\u4f5c\u7684\u6709\u52a9\u4e8e\u4f60\u5f88\u5feb\u7406\u89e3\u4e3a\u4f55\u67d0\u4e2a\u6b63\u5219\u8868\u8fbe\u5f0f\u4e0d\u50cf\u4f60\u671f\u671b\u7684\u90a3\u6837\u5de5\u4f5c\u3002<\/p>\n \u6709\u4e24\u79cd\u7c7b\u578b\u7684\u5f15\u64ce\uff1a\u6587\u672c\u5bfc\u5411(text-directed)\u7684\u5f15\u64ce\u548c\u6b63\u5219\u5bfc\u5411(regex-directed)\u7684\u5f15\u64ce\u3002Jeffrey Friedl\u628a\u4ed6\u4eec\u79f0\u4f5cDFA\u548cNFA\u5f15\u64ce\u3002\u672c\u6587\u8c08\u5230\u7684\u662f\u6b63\u5219\u5bfc\u5411\u7684\u5f15\u64ce\u3002\u8fd9\u662f\u56e0\u4e3a\u4e00\u4e9b\u975e\u5e38\u6709\u7528\u7684\u7279\u6027\uff0c\u5982\u201c\u60f0\u6027\u201d\u91cf\u8bcd(lazy quantifiers)\u548c\u53cd\u5411\u5f15\u7528(backreferences)\uff0c\u53ea\u80fd\u5728\u6b63\u5219\u5bfc\u5411\u7684\u5f15\u64ce\u4e2d\u5b9e\u73b0\u3002\u6240\u4ee5\u6beb\u4e0d\u610f\u5916\u8fd9\u79cd\u5f15\u64ce\u662f\u76ee\u524d\u6700\u6d41\u884c\u7684\u5f15\u64ce\u3002<\/p>\n \u4f60\u53ef\u4ee5\u8f7b\u6613\u5206\u8fa8\u51fa\u6240\u4f7f\u7528\u7684\u5f15\u64ce\u662f\u6587\u672c\u5bfc\u5411\u8fd8\u662f\u6b63\u5219\u5bfc\u5411\u3002\u5982\u679c\u53cd\u5411\u5f15\u7528\u6216\u201c\u60f0\u6027\u201d\u91cf\u8bcd\u88ab\u5b9e\u73b0\uff0c\u5219\u53ef\u4ee5\u80af\u5b9a\u4f60\u4f7f\u7528\u7684\u5f15\u64ce\u662f\u6b63\u5219\u5bfc\u5411\u7684\u3002\u4f60\u53ef\u4ee5\u4f5c\u5982\u4e0b\u6d4b\u8bd5\uff1a\u5c06\u6b63\u5219\u8868\u8fbe\u5f0f<<regex|regex not>>\u5e94\u7528\u5230\u5b57\u7b26\u4e32\u201cregex not\u201d\u3002\u5982\u679c\u5339\u914d\u7684\u7ed3\u679c\u662fregex\uff0c\u5219\u5f15\u64ce\u662f\u6b63\u5219\u5bfc\u5411\u7684\u3002\u5982\u679c\u7ed3\u679c\u662fregex not\uff0c\u5219\u662f\u6587\u672c\u5bfc\u5411\u7684\u3002\u56e0\u4e3a\u6b63\u5219\u5bfc\u5411\u7684\u5f15\u64ce\u662f\u201c\u7334\u6025\u201d\u7684\uff0c\u5b83\u4f1a\u5f88\u6025\u5207\u7684\u8fdb\u884c\u8868\u529f\uff0c\u62a5\u544a\u5b83\u627e\u5230\u7684\u7b2c\u4e00\u4e2a\u5339\u914d \u3002<\/p>\n <\/p>\n \u8fd9\u662f\u9700\u8981\u4f60\u7406\u89e3\u7684\u5f88\u91cd\u8981\u7684\u4e00\u70b9\uff1a\u5373\u4f7f\u4ee5\u540e\u6709\u53ef\u80fd\u53d1\u73b0\u4e00\u4e2a\u201c\u66f4\u597d\u201d\u7684\u5339\u914d\uff0c\u6b63\u5219\u5bfc\u5411\u7684\u5f15\u64ce\u4e5f\u603b\u662f\u8fd4\u56de\u6700\u5de6\u8fb9\u7684\u5339\u914d\u3002<\/p>\n \u5f53\u628a<<cat>>\u5e94\u7528\u5230\u201cHe captured a catfish for his cat\u201d\uff0c\u5f15\u64ce\u5148\u6bd4\u8f83<<c>>\u548c\u201cH\u201d\uff0c\u7ed3\u679c\u5931\u8d25\u4e86\u3002\u4e8e\u662f\u5f15\u64ce\u518d\u6bd4\u8f83<<c>>\u548c\u201ce\u201d\uff0c\u4e5f\u5931\u8d25\u4e86\u3002\u76f4\u5230\u7b2c\u56db\u4e2a\u5b57\u7b26\uff0c<<c>>\u5339\u914d\u4e86\u201cc\u201d\u3002<<a>>\u5339\u914d\u4e86\u7b2c\u4e94\u4e2a\u5b57\u7b26\u3002\u5230\u7b2c\u516d\u4e2a\u5b57\u7b26<<t>>\u6ca1\u80fd\u5339\u914d\u201cp\u201d\uff0c\u4e5f\u5931\u8d25\u4e86\u3002\u5f15\u64ce\u518d\u7ee7\u7eed\u4ece\u7b2c\u4e94\u4e2a\u5b57\u7b26\u91cd\u65b0\u68c0\u67e5\u5339\u914d\u6027\u3002\u76f4\u5230\u7b2c\u5341\u4e94\u4e2a\u5b57\u7b26\u5f00\u59cb\uff0c<<cat>>\u5339\u914d\u4e0a\u4e86\u201ccatfish\u201d\u4e2d\u7684\u201ccat\u201d\uff0c\u6b63\u5219\u8868\u8fbe\u5f0f\u5f15\u64ce\u6025\u5207\u7684\u8fd4\u56de\u7b2c\u4e00\u4e2a\u5339\u914d\u7684\u7ed3\u679c\uff0c\u800c\u4e0d\u4f1a\u518d\u7ee7\u7eed\u67e5\u627e\u662f\u5426\u6709\u5176\u4ed6\u66f4\u597d\u7684\u5339\u914d\u3002<\/p>\n <\/p>\n <\/p>\n \u5b57\u7b26\u96c6\u662f\u7531\u4e00\u5bf9\u65b9\u62ec\u53f7\u201c[]\u201d\u62ec\u8d77\u6765\u7684\u5b57\u7b26\u96c6\u5408\u3002\u4f7f\u7528\u5b57\u7b26\u96c6\uff0c\u4f60\u53ef\u4ee5\u544a\u8bc9\u6b63\u5219\u8868\u8fbe\u5f0f\u5f15\u64ce\u4ec5\u4ec5\u5339\u914d\u591a\u4e2a\u5b57\u7b26\u4e2d\u7684\u4e00\u4e2a\u3002\u5982\u679c\u4f60\u60f3\u5339\u914d\u4e00\u4e2a\u201ca\u201d\u6216\u4e00\u4e2a\u201ce\u201d\uff0c\u4f7f\u7528<<[ae]>>\u3002\u4f60\u53ef\u4ee5\u4f7f\u7528<<gr[ae]y>>\u5339\u914dgray\u6216grey\u3002\u8fd9\u5728\u4f60\u4e0d\u786e\u5b9a\u4f60\u8981\u641c\u7d22\u7684\u5b57\u7b26\u662f\u91c7\u7528\u7f8e\u56fd\u82f1\u8bed\u8fd8\u662f\u82f1\u56fd\u82f1\u8bed\u65f6\u7279\u522b\u6709\u7528\u3002\u76f8\u53cd\uff0c<<gr[ae]y>>\u5c06\u4e0d\u4f1a\u5339\u914dgraay\u6216graey\u3002\u5b57\u7b26\u96c6\u4e2d\u7684\u5b57\u7b26\u987a\u5e8f\u5e76\u6ca1\u6709\u4ec0\u4e48\u5173\u7cfb\uff0c\u7ed3\u679c\u90fd\u662f\u76f8\u540c\u7684\u3002<\/p>\n 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<\/p>\n \u56e0\u4e3a\u4e00\u4e9b\u5b57\u7b26\u96c6\u975e\u5e38\u5e38\u7528\uff0c\u6240\u4ee5\u6709\u4e00\u4e9b\u7b80\u5199\u65b9\u5f0f\u3002<\/p>\n <<\\d>>\u4ee3\u8868<<[0-9]>>;<\/p>\n <<\\w>>\u4ee3\u8868\u5355\u8bcd\u5b57\u7b26\u3002\u8fd9\u4e2a\u662f\u968f\u6b63\u5219\u8868\u8fbe\u5f0f\u5b9e\u73b0\u7684\u4e0d\u540c\u800c\u6709\u4e9b\u5dee\u5f02\u3002\u7edd\u5927\u591a\u6570\u7684\u6b63\u5219\u8868\u8fbe\u5f0f\u5b9e\u73b0\u7684\u5355\u8bcd\u5b57\u7b26\u96c6\u90fd\u5305\u542b\u4e86<<A-Za-z0-9_]>>\u3002<\/p>\n <<\\s>>\u4ee3\u8868\u201c\u767d\u5b57\u7b26\u201d\u3002\u8fd9\u4e2a\u4e5f\u662f\u548c\u4e0d\u540c\u7684\u5b9e\u73b0\u6709\u5173\u7684\u3002\u5728\u7edd\u5927\u591a\u6570\u7684\u5b9e\u73b0\u4e2d\uff0c\u90fd\u5305\u542b\u4e86\u7a7a\u683c\u7b26\u548cTab\u7b26\uff0c\u4ee5\u53ca\u56de\u8f66\u6362\u884c\u7b26<<\\r\\n>>\u3002<\/p>\n 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<[A-Za-z][A-Za-z0-9]*>\u5339\u914d\u6ca1\u6709\u5c5e\u6027\u7684HTML\u6807\u7b7e\uff0c\u201c<\u201d\u4ee5\u53ca\u201c>\u201d\u662f\u6587\u5b57\u7b26\u53f7\u3002\u7b2c\u4e00\u4e2a\u5b57\u7b26\u96c6\u5339\u914d\u4e00\u4e2a\u5b57\u6bcd\uff0c\u7b2c\u4e8c\u4e2a\u5b57\u7b26\u96c6\u5339\u914d\u4e00\u4e2a\u5b57\u6bcd\u6216\u6570\u5b57\u3002<\/p>\n \u6211\u4eec\u4f3c\u4e4e\u4e5f\u53ef\u4ee5\u7528<[A-Za-z0-9]+>\u3002\u4f46\u662f\u5b83\u4f1a\u5339\u914d<1>\u3002\u4f46\u662f\u8fd9\u4e2a\u6b63\u5219\u8868\u8fbe\u5f0f\u5728\u4f60\u77e5\u9053\u4f60\u8981\u641c\u7d22\u7684\u5b57\u7b26\u4e32\u4e0d\u5305\u542b\u7c7b\u4f3c\u7684\u65e0\u6548\u6807\u7b7e\u65f6\u8fd8\u662f\u8db3\u591f\u6709\u6548\u7684\u3002<\/p>\n <\/p>\n 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\u5047\u8bbe\u4f60\u60f3\u7528\u4e00\u4e2a\u6b63\u5219\u8868\u8fbe\u5f0f\u5339\u914d\u4e00\u4e2aHTML\u6807\u7b7e\u3002\u4f60\u77e5\u9053\u8f93\u5165\u5c06\u4f1a\u662f\u4e00\u4e2a\u6709\u6548\u7684HTML\u6587\u4ef6\uff0c\u56e0\u6b64\u6b63\u5219\u8868\u8fbe\u5f0f\u4e0d\u9700\u8981\u6392\u9664\u90a3\u4e9b\u65e0\u6548\u7684\u6807\u7b7e\u3002\u6240\u4ee5\u5982\u679c\u662f\u5728\u4e24\u4e2a\u5c16\u62ec\u53f7\u4e4b\u95f4\u7684\u5185\u5bb9\uff0c\u5c31\u5e94\u8be5\u662f\u4e00\u4e2aHTML\u6807\u7b7e\u3002<\/p>\n \u8bb8\u591a\u6b63\u5219\u8868\u8fbe\u5f0f\u7684\u65b0\u624b\u4f1a\u9996\u5148\u60f3\u5230\u7528\u6b63\u5219\u8868\u8fbe\u5f0f<< <.+> >>\uff0c\u4ed6\u4eec\u4f1a\u5f88\u60ca\u8bb6\u7684\u53d1\u73b0\uff0c\u5bf9\u4e8e\u6d4b\u8bd5\u5b57\u7b26\u4e32\uff0c\u201cThis is a <EM>first<\/EM> test\u201d\uff0c\u4f60\u53ef\u80fd\u671f\u671b\u4f1a\u8fd4\u56de<EM>\uff0c\u7136\u540e\u7ee7\u7eed\u8fdb\u884c\u5339\u914d\u7684\u65f6\u5019\uff0c\u8fd4\u56de<\/EM>\u3002<\/p>\n \u4f46\u4e8b\u5b9e\u662f\u4e0d\u4f1a\u3002\u6b63\u5219\u8868\u8fbe\u5f0f\u5c06\u4f1a\u5339\u914d\u201c<EM>first<\/EM>\u201d\u3002\u5f88\u663e\u7136\u8fd9\u4e0d\u662f\u6211\u4eec\u60f3\u8981\u7684\u7ed3\u679c\u3002\u539f\u56e0\u5728\u4e8e\u201c+\u201d\u662f\u8d2a\u5a6a\u7684\u3002\u4e5f\u5c31\u662f\u8bf4\uff0c\u201c+\u201d\u4f1a\u5bfc\u81f4\u6b63\u5219\u8868\u8fbe\u5f0f\u5f15\u64ce\u8bd5\u56fe\u5c3d\u53ef\u80fd\u7684\u91cd\u590d\u524d\u5bfc\u5b57\u7b26\u3002\u53ea\u6709\u5f53\u8fd9\u79cd\u91cd\u590d\u4f1a\u5f15\u8d77\u6574\u4e2a\u6b63\u5219\u8868\u8fbe\u5f0f\u5339\u914d\u5931\u8d25\u7684\u60c5\u51b5\u4e0b\uff0c\u5f15\u64ce\u4f1a\u8fdb\u884c\u56de\u6eaf\u3002\u4e5f\u5c31\u662f\u8bf4\uff0c\u5b83\u4f1a\u653e\u5f03\u6700\u540e\u4e00\u6b21\u7684\u201c\u91cd\u590d\u201d\uff0c\u7136\u540e\u5904\u7406\u6b63\u5219\u8868\u8fbe\u5f0f\u4f59\u4e0b\u7684\u90e8\u5206\u3002<\/p>\n \u548c\u201c+\u201d\u7c7b\u4f3c\uff0c\u201c?*\u201d\u7684\u91cd\u590d\u4e5f\u662f\u8d2a\u5a6a\u7684\u3002<\/p>\n <\/p>\n 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test\u201d\u3002\u5f15\u64ce\u4f1a\u8bd5\u56fe\u5c06\u201c>\u201d\u4e0e\u6362\u884c\u7b26\u8fdb\u884c\u5339\u914d\uff0c\u7ed3\u679c\u5931\u8d25\u4e86\u3002\u4e8e\u662f\u5f15\u64ce\u8fdb\u884c\u56de\u6eaf\u3002\u7ed3\u679c\u662f\u73b0\u5728\u201c<.+\u201d\u5339\u914d\u201c<EM>first<\/EM> tes\u201d\u3002\u4e8e\u662f\u5f15\u64ce\u5c06\u201c>\u201d\u4e0e\u201ct\u201d\u8fdb\u884c\u5339\u914d\u3002\u663e\u7136\u8fd8\u662f\u4f1a\u5931\u8d25\u3002\u8fd9\u4e2a\u8fc7\u7a0b\u7ee7\u7eed\uff0c\u76f4\u5230\u201c<.+\u201d\u5339\u914d\u201c<EM>first<\/EM\u201d\uff0c\u201c>\u201d\u4e0e\u201c>\u201d\u5339\u914d\u3002\u4e8e\u662f\u5f15\u64ce\u627e\u5230\u4e86\u4e00\u4e2a\u5339\u914d\u201c<EM>first<\/EM>\u201d\u3002\u8bb0\u4f4f\uff0c\u6b63\u5219\u5bfc\u5411\u7684\u5f15\u64ce\u662f\u201c\u6025\u5207\u7684\u201d\uff0c\u6240\u4ee5\u5b83\u4f1a\u6025\u7740\u62a5\u544a\u5b83\u627e\u5230\u7684\u7b2c\u4e00\u4e2a\u5339\u914d\u3002\u800c\u4e0d\u662f\u7ee7\u7eed\u56de\u6eaf\uff0c\u5373\u4f7f\u53ef\u80fd\u4f1a\u6709\u66f4\u597d\u7684\u5339\u914d\uff0c\u4f8b\u5982\u201c<EM>\u201d\u3002\u6240\u4ee5\u6211\u4eec\u53ef\u4ee5\u770b\u5230\uff0c\u7531\u4e8e\u201c+\u201d\u7684\u8d2a\u5a6a\u6027\uff0c\u4f7f\u5f97\u6b63\u5219\u8868\u8fbe\u5f0f\u5f15\u64ce\u8fd4\u56de\u4e86\u4e00\u4e2a\u6700\u5de6\u8fb9\u7684\u6700\u957f\u7684\u5339\u914d\u3002<\/p>\n <\/p>\n \u4e00\u4e2a\u7528\u4e8e\u4fee\u6b63\u4ee5\u4e0a\u95ee\u9898\u7684\u53ef\u80fd\u65b9\u6848\u662f\u7528\u201c+\u201d\u7684\u60f0\u6027\u4ee3\u66ff\u8d2a\u5a6a\u6027\u3002\u4f60\u53ef\u4ee5\u5728\u201c+\u201d\u540e\u9762\u7d27\u8ddf\u4e00\u4e2a\u95ee\u53f7\u201c?\u201d\u6765\u8fbe\u5230\u8fd9\u4e00\u70b9\u3002\u201c*\u201d\uff0c\u201c{}\u201d\u548c\u201c?\u201d\u8868\u793a\u7684\u91cd\u590d\u4e5f\u53ef\u4ee5\u7528\u8fd9\u4e2a\u65b9\u6848\u3002\u56e0\u6b64\u5728\u4e0a\u9762\u7684\u4f8b\u5b50\u4e2d\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u201c<.+?>\u201d\u3002\u8ba9\u6211\u4eec\u518d\u6765\u770b\u770b\u6b63\u5219\u8868\u8fbe\u5f0f\u5f15\u64ce\u7684\u5904\u7406\u8fc7\u7a0b\u3002<\/p>\n 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<\/p>\n \u6211\u4eec\u8fd8\u6709\u4e00\u4e2a\u66f4\u597d\u7684\u66ff\u4ee3\u65b9\u6848\u3002\u53ef\u4ee5\u7528\u4e00\u4e2a\u8d2a\u5a6a\u91cd\u590d\u4e0e\u4e00\u4e2a\u53d6\u53cd\u5b57\u7b26\u96c6\uff1a\u201c<[^>]+>\u201d\u3002\u4e4b\u6240\u4ee5\u8bf4\u8fd9\u662f\u4e00\u4e2a\u66f4\u597d\u7684\u65b9\u6848\u5728\u4e8e\u4f7f\u7528\u60f0\u6027\u91cd\u590d\u65f6\uff0c\u5f15\u64ce\u4f1a\u5728\u627e\u5230\u4e00\u4e2a\u6210\u529f\u5339\u914d\u524d\u5bf9\u6bcf\u4e00\u4e2a\u5b57\u7b26\u8fdb\u884c\u56de\u6eaf\u3002\u800c\u4f7f\u7528\u53d6\u53cd\u5b57\u7b26\u96c6\u5219\u4e0d\u9700\u8981\u8fdb\u884c\u56de\u6eaf\u3002<\/p>\n \u6700\u540e\u8981\u8bb0\u4f4f\u7684\u662f\uff0c\u672c\u6559\u7a0b\u4ec5\u4ec5\u8c08\u5230\u7684\u662f\u6b63\u5219\u5bfc\u5411\u7684\u5f15\u64ce\u3002\u6587\u672c\u5bfc\u5411\u7684\u5f15\u64ce\u662f\u4e0d\u56de\u6eaf\u7684\u3002\u4f46\u662f\u540c\u65f6\u4ed6\u4eec\u4e5f\u4e0d\u652f\u6301\u60f0\u6027\u91cd\u590d\u64cd\u4f5c\u3002<\/p>\n <\/p>\n 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