{"id":650,"date":"2009-09-24T19:06:00","date_gmt":"2009-09-24T11:06:00","guid":{"rendered":""},"modified":"2013-11-24T20:50:46","modified_gmt":"2013-11-24T12:50:46","slug":"%e6%ad%a3%e5%88%99%e8%a1%a8%e8%be%be%e5%bc%8f%e5%8d%b3%e5%ad%a6%e5%8d%b3%e7%94%a8%e4%b8%80","status":"publish","type":"post","link":"https:\/\/kyle.ai\/blog\/650.html","title":{"rendered":"\u6b63\u5219\u8868\u8fbe\u5f0f\u5373\u5b66\u5373\u7528(\u4e00)"},"content":{"rendered":"

\u63ed\u5f00\u6b63\u5219\u8868\u8fbe\u5f0f\u7684\u795e\u79d8\u9762\u7eb1<\/p>\n

\u5f15\u8a00<\/p>\n

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\u6362\u64cd\u4f5c\u3002<\/p>\n

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1. \u6b63\u5219\u8868\u8fbe\u5f0f\u89c4\u5219<\/p>\n

1.1 \u666e\u901a\u5b57\u7b26<\/p>\n

\u5b57\u6bcd\u3001\u6570\u5b57\u3001\u6c49\u5b57\u3001\u4e0b\u5212\u7ebf\u3001\u4ee5\u53ca\u540e\u8fb9\u7ae0\u8282\u4e2d\u6ca1\u6709\u7279\u6b8a\u5b9a\u4e49\u7684\u6807\u70b9\u7b26\u53f7\uff0c\u90fd\u662f”\u666e\u901a\u5b57\u7b26”\u3002\u8868\u8fbe<\/p>\n

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\u4e3e\u4f8b1\uff1a\u8868\u8fbe\u5f0f “c”\uff0c\u5728\u5339\u914d\u5b57\u7b26\u4e32 “abcde” \u65f6\uff0c\u5339\u914d\u7ed3\u679c\u662f\uff1a\u6210\u529f\uff1b\u5339\u914d\u5230\u7684\u5185\u5bb9\u662f\uff1a”c”\uff1b\u5339<\/p>\n

\u914d\u5230\u7684\u4f4d\u7f6e\u662f\uff1a\u5f00\u59cb\u4e8e2\uff0c\u7ed3\u675f\u4e8e3\u3002\uff08\u6ce8\uff1a\u4e0b\u6807\u4ece0\u5f00\u59cb\u8fd8\u662f\u4ece1\u5f00\u59cb\uff0c\u56e0\u5f53\u524d\u7f16\u7a0b\u8bed\u8a00\u7684\u4e0d\u540c\u800c\u53ef\u80fd<\/p>\n

\u4e0d\u540c\uff09<\/p>\n

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1.2 \u7b80\u5355\u7684\u8f6c\u4e49\u5b57\u7b26<\/p>\n

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\u2520\u2500\u2500\u2500\u2500\u253c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2528<\/p>\n

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\u2503\\t\u00a0\u00a0\u00a0\u00a0\u00a0 \u2502\u5236\u8868\u7b26\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u2503<\/p>\n

\u2520\u2500\u2500\u2500\u2500\u253c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2528<\/p>\n

\u2503\\\\\u00a0\u00a0\u00a0\u00a0\u00a0 \u2502\u4ee3\u8868 “\\” \u672c\u8eab\u00a0\u00a0\u00a0\u00a0 \u2503<\/p>\n

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\uff1a^, $ \u90fd\u6709\u7279\u6b8a\u610f\u4e49\uff0c\u5982\u679c\u8981\u60f3\u5339\u914d\u5b57\u7b26\u4e32\u4e2d “^” \u548c “$” \u5b57\u7b26\uff0c\u5219\u8868\u8fbe\u5f0f\u5c31\u9700\u8981\u5199\u6210 “\\^” \u548c<\/p>\n

“\\$”\u3002<\/p>\n

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\u2520\u2500\u2500\u2500\u2500\u253c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2528<\/p>\n

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\u2520\u2500\u2500\u2500\u2500\u253c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2528<\/p>\n

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1.3 \u80fd\u591f\u4e0e ‘\u591a\u79cd\u5b57\u7b26’ \u5339\u914d\u7684\u8868\u8fbe\u5f0f<\/p>\n

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\u2520\u2500\u2500\u2500\u2500\u253c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2528<\/p>\n

\u2503\\s\u00a0\u00a0\u00a0\u00a0\u00a0 \u2502\u5305\u62ec\u7a7a\u683c\u3001\u5236\u8868\u7b26\u3001\u6362\u9875\u7b26\u7b49\u7a7a\u767d\u5b57\u7b26\u7684\u5176\u4e2d\u4efb\u610f\u4e00\u4e2a\u00a0\u00a0\u00a0 \u2503<\/p>\n

\u2520\u2500\u2500\u2500\u2500\u253c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2528<\/p>\n

\u2503.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u2502\u5c0f\u6570\u70b9\u53ef\u4ee5\u5339\u914d\u9664\u4e86\u6362\u884c\u7b26\uff08\\n\uff09\u4ee5\u5916\u7684\u4efb\u610f\u4e00\u4e2a\u5b57\u7b26\u00a0\u00a0\u00a0 \u2503<\/p>\n

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\u4e3e\u4f8b2\uff1a\u8868\u8fbe\u5f0f “a.\\d”\uff0c\u5728\u5339\u914d “aaa100” \u65f6\uff0c\u5339\u914d\u7684\u7ed3\u679c\u662f\uff1a\u6210\u529f\uff1b\u5339\u914d\u5230\u7684\u5185\u5bb9\u662f\uff1a”aa1″\uff1b<\/p>\n

\u5339\u914d\u5230\u7684\u4f4d\u7f6e\u662f\uff1a\u5f00\u59cb\u4e8e1\uff0c\u7ed3\u675f\u4e8e4\u3002<\/p>\n

1.4 \u81ea\u5b9a\u4e49\u80fd\u591f\u5339\u914d ‘\u591a\u79cd\u5b57\u7b26’ \u7684\u8868\u8fbe\u5f0f<\/p>\n

\u4f7f\u7528\u65b9\u62ec\u53f7 [ ] \u5305\u542b\u4e00\u7cfb\u5217\u5b57\u7b26\uff0c\u80fd\u591f\u5339\u914d\u5176\u4e2d\u4efb\u610f\u4e00\u4e2a\u5b57\u7b26\u3002\u7528 [^ ] \u5305\u542b\u4e00\u7cfb\u5217\u5b57\u7b26\uff0c\u5219\u80fd<\/p>\n

\u591f\u5339\u914d\u5176\u4e2d\u5b57\u7b26\u4e4b\u5916\u7684\u4efb\u610f\u4e00\u4e2a\u5b57\u7b26\u3002\u540c\u6837\u7684\u9053\u7406\uff0c\u867d\u7136\u53ef\u4ee5\u5339\u914d\u5176\u4e2d\u4efb\u610f\u4e00\u4e2a\uff0c\u4f46\u662f\u53ea\u80fd\u662f\u4e00\u4e2a\uff0c<\/p>\n

\u4e0d\u662f\u591a\u4e2a\u3002<\/p>\n

\u250f\u2501\u2501\u2501\u2501\u2501\u252f\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2513<\/p>\n

\u2503\u8868\u8fbe\u5f0f\u00a0\u00a0\u00a0 \u2502\u53ef\u5339\u914d\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u2503<\/p>\n

\u2520\u2500\u2500\u2500\u2500\u2500\u253c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2528<\/p>\n

\u2503[ab5@]\u00a0\u00a0\u00a0 \u2502\u5339\u914d “a” \u6216 “b” \u6216 “5” \u6216 “@”\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u2503<\/p>\n

\u2520\u2500\u2500\u2500\u2500\u2500\u253c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2528<\/p>\n

\u2503[^abc]\u00a0\u00a0\u00a0 \u2502\u5339\u914d “a”,”b”,”c” \u4e4b\u5916\u7684\u4efb\u610f\u4e00\u4e2a\u5b57\u7b26\u00a0\u00a0\u00a0\u00a0 \u2503<\/p>\n

\u2520\u2500\u2500\u2500\u2500\u2500\u253c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2528<\/p>\n

\u2503[f-k]\u00a0\u00a0\u00a0\u00a0 \u2502\u5339\u914d “f”~”k” \u4e4b\u95f4\u7684\u4efb\u610f\u4e00\u4e2a\u5b57\u6bcd\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u2503<\/p>\n

\u2520\u2500\u2500\u2500\u2500\u2500\u253c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2528<\/p>\n

\u2503[^A-F0-3] \u2502\u5339\u914d “A”~”F”,”0″~”3″ \u4e4b\u5916\u7684\u4efb\u610f\u4e00\u4e2a\u5b57\u7b26 \u2503<\/p>\n

\u2517\u2501\u2501\u2501\u2501\u2501\u2537\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u251b<\/p>\n

\u4e3e\u4f8b1\uff1a\u8868\u8fbe\u5f0f “[bcd][bcd]” \u5339\u914d “abc123″ \u65f6\uff0c\u5339\u914d\u7684\u7ed3\u679c\u662f\uff1a\u6210\u529f\uff1b\u5339\u914d\u5230\u7684\u5185\u5bb9\u662f\uff1a”bc”<\/p>\n

\uff1b\u5339\u914d\u5230\u7684\u4f4d\u7f6e\u662f\uff1a\u5f00\u59cb\u4e8e1\uff0c\u7ed3\u675f\u4e8e3\u3002<\/p>\n

\u4e3e\u4f8b2\uff1a\u8868\u8fbe\u5f0f “[^abc]” \u5339\u914d “abc123″ \u65f6\uff0c\u5339\u914d\u7684\u7ed3\u679c\u662f\uff1a\u6210\u529f\uff1b\u5339\u914d\u5230\u7684\u5185\u5bb9\u662f\uff1a”1″\uff1b\u5339<\/p>\n

\u914d\u5230\u7684\u4f4d\u7f6e\u662f\uff1a\u5f00\u59cb\u4e8e3\uff0c\u7ed3\u675f\u4e8e4\u3002<\/p>\n

1.5 \u4fee\u9970\u5339\u914d\u6b21\u6570\u7684\u7279\u6b8a\u7b26\u53f7<\/p>\n

\u524d\u9762\u7ae0\u8282\u4e2d\u8bb2\u5230\u7684\u8868\u8fbe\u5f0f\uff0c\u65e0\u8bba\u662f\u53ea\u80fd\u5339\u914d\u4e00\u79cd\u5b57\u7b26\u7684\u8868\u8fbe\u5f0f\uff0c\u8fd8\u662f\u53ef\u4ee5\u5339\u914d\u591a\u79cd\u5b57\u7b26\u5176\u4e2d\u4efb\u610f<\/p>\n

\u4e00\u4e2a\u7684\u8868\u8fbe\u5f0f\uff0c\u90fd\u53ea\u80fd\u5339\u914d\u4e00\u6b21\u3002\u5982\u679c\u4f7f\u7528\u8868\u8fbe\u5f0f\u518d\u52a0\u4e0a\u4fee\u9970\u5339\u914d\u6b21\u6570\u7684\u7279\u6b8a\u7b26\u53f7\uff0c\u90a3\u4e48\u4e0d\u7528\u91cd\u590d\u4e66<\/p>\n

\u5199\u8868\u8fbe\u5f0f\u5c31\u53ef\u4ee5\u91cd\u590d\u5339\u914d\u3002<\/p>\n

\u4f7f\u7528\u65b9\u6cd5\u662f\uff1a”\u6b21\u6570\u4fee\u9970”\u653e\u5728”\u88ab\u4fee\u9970\u7684\u8868\u8fbe\u5f0f”\u540e\u8fb9\u3002\u6bd4\u5982\uff1a”[bcd][bcd]” \u53ef\u4ee5\u5199\u6210 “[bcd]<\/p>\n

{2}”\u3002<\/p>\n

\u250f\u2501\u2501\u2501\u2501\u2501\u252f\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2513<\/p>\n

\u2503\u8868\u8fbe\u5f0f\u00a0\u00a0\u00a0 \u2502\u53ef\u5339\u914d\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u2503<\/p>\n

\u2520\u2500\u2500\u2500\u2500\u2500\u253c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2528<\/p>\n

\u2503{n}\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u2502\u8868\u8fbe\u5f0f\u91cd\u590dn\u6b21\uff0c\u6bd4\u5982\uff1a”\\w{2}” \u76f8\u5f53\u4e8e “\\w\\w”\uff1b”a{5}”\u76f8\u5f53\u4e8e\u00a0\u00a0\u00a0 \u2503<\/p>\n

\u2503\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u2502”aaaaa”\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u2503<\/p>\n

\u2520\u2500\u2500\u2500\u2500\u2500\u253c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2528<\/p>\n

\u2503{m,n}\u00a0\u00a0\u00a0\u00a0 \u2502\u8868\u8fbe\u5f0f\u81f3\u5c11\u91cd\u590dm\u6b21\uff0c\u6700\u591a\u91cd\u590dn\u6b21\uff0c\u6bd4\u5982\uff1a”ba{1,3}”\u53ef\u4ee5\u5339\u914d”ba” \u2503<\/p>\n

\u2503\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u2502\u6216”baa”\u6216”baaa”\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u2503<\/p>\n

\u2520\u2500\u2500\u2500\u2500\u2500\u253c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2528<\/p>\n

\u2503{m,}\u00a0\u00a0\u00a0\u00a0\u00a0 \u2502\u8868\u8fbe\u5f0f\u81f3\u5c11\u91cd\u590dm\u6b21\uff0c\u6bd4\u5982\uff1a”\\w\\d{2,}”\u53ef\u4ee5\u5339\u914d “a12″,”_456″,\u00a0\u00a0 \u2503<\/p>\n

\u2503\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u2502”M12344″…\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u2503<\/p>\n

\u2520\u2500\u2500\u2500\u2500\u2500\u253c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2528<\/p>\n

\u2503?\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u2502\u5339\u914d\u8868\u8fbe\u5f0f0\u6b21\u6216\u80051\u6b21\uff0c\u76f8\u5f53\u4e8e {0,1}\uff0c\u6bd4\u5982\uff1a”a[cd]?”\u53ef\u4ee5\u5339\u914d \u2503<\/p>\n

\u2503\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u2502”a”,”ac”,”ad”\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u2503<\/p>\n

\u2520\u2500\u2500\u2500\u2500\u2500\u253c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2528<\/p>\n

\u2503+\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u2502\u8868\u8fbe\u5f0f\u81f3\u5c11\u51fa\u73b01\u6b21\uff0c\u76f8\u5f53\u4e8e {1,}\uff0c\u6bd4\u5982\uff1a”a+b”\u53ef\u4ee5\u5339\u914d “ab”,\u00a0\u00a0 \u2503<\/p>\n

\u2503\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u2502”aab”,”aaab”…\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u2503<\/p>\n

\u2520\u2500\u2500\u2500\u2500\u2500\u253c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2528<\/p>\n

\u2503*\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u2502\u8868\u8fbe\u5f0f\u4e0d\u51fa\u73b0\u6216\u51fa\u73b0\u4efb\u610f\u6b21\uff0c\u76f8\u5f53\u4e8e {0,}\uff0c\u6bd4\u5982\uff1a”\\^*b”\u53ef\u4ee5\u5339\u914d \u2503<\/p>\n

\u2503\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u2502 “b”,”^^^b”…\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u2503<\/p>\n

\u2517\u2501\u2501\u2501\u2501\u2501\u2537\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u251b<\/p>\n

\u4e3e\u4f8b1\uff1a\u8868\u8fbe\u5f0f “\\d+\\.?\\d*” \u5728\u5339\u914d “It costs $12.5” \u65f6\uff0c\u5339\u914d\u7684\u7ed3\u679c\u662f\uff1a\u6210\u529f\uff1b\u5339\u914d\u5230\u7684\u5185<\/p>\n

\u5bb9\u662f\uff1a”12.5″\uff1b\u5339\u914d\u5230\u7684\u4f4d\u7f6e\u662f\uff1a\u5f00\u59cb\u4e8e10\uff0c\u7ed3\u675f\u4e8e14\u3002<\/p>\n

\u4e3e\u4f8b2\uff1a\u8868\u8fbe\u5f0f “go{2,8}gle” \u5728\u5339\u914d “Ads by goooooogle” \u65f6\uff0c\u5339\u914d\u7684\u7ed3\u679c\u662f\uff1a\u6210\u529f\uff1b\u5339\u914d\u5230<\/p>\n

\u7684\u5185\u5bb9\u662f\uff1a”goooooogle”\uff1b\u5339\u914d\u5230\u7684\u4f4d\u7f6e\u662f\uff1a\u5f00\u59cb\u4e8e7\uff0c\u7ed3\u675f\u4e8e17\u3002<\/p>\n

1.6 \u5176\u4ed6\u4e00\u4e9b\u4ee3\u8868\u62bd\u8c61\u610f\u4e49\u7684\u7279\u6b8a\u7b26\u53f7<\/p>\n

\u4e00\u4e9b\u7b26\u53f7\u5728\u8868\u8fbe\u5f0f\u4e2d\u4ee3\u8868\u62bd\u8c61\u7684\u7279\u6b8a\u610f\u4e49\uff1a<\/p>\n

\u250f\u2501\u2501\u2501\u2501\u2501\u252f\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2513<\/p>\n

\u2503\u8868\u8fbe\u5f0f\u00a0\u00a0\u00a0 \u2502\u53ef\u5339\u914d\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u2503<\/p>\n

\u2520\u2500\u2500\u2500\u2500\u2500\u253c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2528<\/p>\n

\u2503^\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u2502\u4e0e\u5b57\u7b26\u4e32\u5f00\u59cb\u7684\u5730\u65b9\u5339\u914d\uff0c\u4e0d\u5339\u914d\u4efb\u4f55\u5b57\u7b26\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u2503<\/p>\n

\u2520\u2500\u2500\u2500\u2500\u2500\u253c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2528<\/p>\n

\u2503$\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u2502\u4e0e\u5b57\u7b26\u4e32\u7ed3\u675f\u7684\u5730\u65b9\u5339\u914d\uff0c\u4e0d\u5339\u914d\u4efb\u4f55\u5b57\u7b26\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u2503<\/p>\n

\u2520\u2500\u2500\u2500\u2500\u2500\u253c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2528<\/p>\n

\u2503\\b\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u2502\u5339\u914d\u4e00\u4e2a\u5355\u8bcd\u8fb9\u754c\uff0c\u4e5f\u5c31\u662f\u5355\u8bcd\u548c\u7a7a\u683c\u4e4b\u95f4\u7684\u4f4d\u7f6e\uff0c\u4e0d\u5339\u2503<\/p>\n

\u2503\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u2502\u914d\u4efb\u4f55\u5b57\u7b26\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u2503<\/p>\n

\u2517\u2501\u2501\u2501\u2501\u2501\u2537\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u251b<\/p>\n

\u8fdb\u4e00\u6b65\u7684\u6587\u5b57\u8bf4\u660e\u4ecd\u7136\u6bd4\u8f83\u62bd\u8c61\uff0c\u56e0\u6b64\uff0c\u4e3e\u4f8b\u5e2e\u52a9\u5927\u5bb6\u7406\u89e3\u3002<\/p>\n

\u4e3e\u4f8b1\uff1a\u8868\u8fbe\u5f0f “^aaa” \u5728\u5339\u914d “xxx aaa xxx” \u65f6\uff0c\u5339\u914d\u7ed3\u679c\u662f\uff1a\u5931\u8d25\u3002\u56e0\u4e3a “^” \u8981\u6c42\u4e0e\u5b57\u7b26\u4e32<\/p>\n

\u5f00\u59cb\u7684\u5730\u65b9\u5339\u914d\uff0c\u56e0\u6b64\uff0c\u53ea\u6709\u5f53 “aaa” \u4f4d\u4e8e\u5b57\u7b26\u4e32\u7684\u5f00\u5934\u7684\u65f6\u5019\uff0c”^aaa” \u624d\u80fd\u5339\u914d\uff0c\u6bd4\u5982\uff1a”aaa<\/p>\n

xxx xxx”\u3002<\/p>\n

\u4e3e\u4f8b2\uff1a\u8868\u8fbe\u5f0f “aaa$” \u5728\u5339\u914d “xxx aaa xxx” \u65f6\uff0c\u5339\u914d\u7ed3\u679c\u662f\uff1a\u5931\u8d25\u3002\u56e0\u4e3a “$” \u8981\u6c42\u4e0e\u5b57\u7b26\u4e32<\/p>\n

\u7ed3\u675f\u7684\u5730\u65b9\u5339\u914d\uff0c\u56e0\u6b64\uff0c\u53ea\u6709\u5f53 “aaa” \u4f4d\u4e8e\u5b57\u7b26\u4e32\u7684\u7ed3\u5c3e\u7684\u65f6\u5019\uff0c”aaa$” \u624d\u80fd\u5339\u914d\uff0c\u6bd4\u5982\uff1a”xxx<\/p>\n

xxx aaa”\u3002<\/p>\n

\u4e3e\u4f8b3\uff1a\u8868\u8fbe\u5f0f “.\\b.” \u5728\u5339\u914d “@@@abc<\/a>” \u65f6\uff0c\u5339\u914d\u7ed3\u679c\u662f\uff1a\u6210\u529f\uff1b\u5339\u914d\u5230\u7684\u5185\u5bb9\u662f\uff1a”@a”\uff1b\u5339\u914d<\/p>\n

\u5230\u7684\u4f4d\u7f6e\u662f\uff1a\u5f00\u59cb\u4e8e2\uff0c\u7ed3\u675f\u4e8e4\u3002<\/p>\n

\u8fdb\u4e00\u6b65\u8bf4\u660e\uff1a”\\b” \u4e0e “^” \u548c “$” \u7c7b\u4f3c\uff0c\u672c\u8eab\u4e0d\u5339\u914d\u4efb\u4f55\u5b57\u7b26\uff0c\u4f46\u662f\u5b83\u8981\u6c42\u5b83\u5728\u5339\u914d\u7ed3\u679c\u4e2d\u6240\u5904<\/p>\n

\u4f4d\u7f6e\u7684\u5de6\u53f3\u4e24\u8fb9\uff0c\u5176\u4e2d\u4e00\u8fb9\u662f “\\w” \u8303\u56f4\uff0c\u53e6\u4e00\u8fb9\u662f \u975e”\\w” \u7684\u8303\u56f4\u3002<\/p>\n

\u4e3e\u4f8b4\uff1a\u8868\u8fbe\u5f0f “\\bend\\b” \u5728\u5339\u914d “weekend,endfor,end” \u65f6\uff0c\u5339\u914d\u7ed3\u679c\u662f\uff1a\u6210\u529f\uff1b\u5339\u914d\u5230\u7684\u5185<\/p>\n

\u5bb9\u662f\uff1a”end”\uff1b\u5339\u914d\u5230\u7684\u4f4d\u7f6e\u662f\uff1a\u5f00\u59cb\u4e8e15\uff0c\u7ed3\u675f\u4e8e18\u3002<\/p>\n

\u4e00\u4e9b\u7b26\u53f7\u53ef\u4ee5\u5f71\u54cd\u8868\u8fbe\u5f0f\u5185\u90e8\u7684\u5b50\u8868\u8fbe\u5f0f\u4e4b\u95f4\u7684\u5173\u7cfb\uff1a<\/p>\n

\u250f\u2501\u2501\u2501\u252f\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2513<\/p>\n

\u2503\u8868\u8fbe\u5f0f\u2502\u4f5c\u7528\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u2503<\/p>\n

\u2520\u2500\u2500\u2500\u253c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2528<\/p>\n

\u2503|\u00a0\u00a0\u00a0\u00a0 \u2502\u4e0e\u5b57\u7b26\u4e32\u7ed3\u675f\u7684\u5730\u65b9\u5339\u914d\uff0c\u4e0d\u5339\u914d\u4efb\u4f55\u5b57\u7b26\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u2503<\/p>\n

\u2520\u2500\u2500\u2500\u253c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2528<\/p>\n

\u2503( )\u00a0\u00a0 \u2502(1). \u5728\u88ab\u4fee\u9970\u5339\u914d\u6b21\u6570\u7684\u65f6\u5019\uff0c\u62ec\u53f7\u4e2d\u7684\u8868\u8fbe\u5f0f\u53ef\u4ee5\u4f5c\u4e3a\u6574 \u2503<\/p>\n

\u2503\u00a0\u00a0\u00a0\u00a0\u00a0 \u2502\u4f53\u88ab\u4fee\u9970\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u2503<\/p>\n

\u2503\u00a0\u00a0\u00a0\u00a0\u00a0 \u2502(2). \u53d6\u5339\u914d\u7ed3\u679c\u7684\u65f6\u5019\uff0c\u62ec\u53f7\u4e2d\u7684\u8868\u8fbe\u5f0f\u5339\u914d\u5230\u7684\u5185\u5bb9\u53ef\u4ee5 \u2503<\/p>\n

\u2503\u00a0\u00a0\u00a0\u00a0\u00a0 \u2502\u88ab\u5355\u72ec\u5f97\u5230\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u2503<\/p>\n

\u2517\u2501\u2501\u2501\u2537\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u251b<\/p>\n

\u4e3e\u4f8b5\uff1a\u8868\u8fbe\u5f0f “Tom|Jack” \u5728\u5339\u914d\u5b57\u7b26\u4e32 “I’m Tom, he is Jack” \u65f6\uff0c\u5339\u914d\u7ed3\u679c\u662f\uff1a\u6210\u529f\uff1b\u5339<\/p>\n

\u914d\u5230\u7684\u5185\u5bb9\u662f\uff1a”Tom”\uff1b\u5339\u914d\u5230\u7684\u4f4d\u7f6e\u662f\uff1a\u5f00\u59cb\u4e8e4\uff0c\u7ed3\u675f\u4e8e7\u3002\u5339\u914d\u4e0b\u4e00\u4e2a\u65f6\uff0c\u5339\u914d\u7ed3\u679c\u662f\uff1a\u6210\u529f\uff1b\u5339<\/p>\n

\u914d\u5230\u7684\u5185\u5bb9\u662f\uff1a”Jack”\uff1b\u5339\u914d\u5230\u7684\u4f4d\u7f6e\u65f6\uff1a\u5f00\u59cb\u4e8e15\uff0c\u7ed3\u675f\u4e8e19\u3002<\/p>\n

\u4e3e\u4f8b6\uff1a\u8868\u8fbe\u5f0f “(go\\s*)+” \u5728\u5339\u914d “Let’s go go go!” \u65f6\uff0c\u5339\u914d\u7ed3\u679c\u662f\uff1a\u6210\u529f\uff1b\u5339\u914d\u5230\u5185\u5bb9\u662f<\/p>\n

\uff1a”go go go”\uff1b\u5339\u914d\u5230\u7684\u4f4d\u7f6e\u662f\uff1a\u5f00\u59cb\u4e8e6\uff0c\u7ed3\u675f\u4e8e14\u3002<\/p>\n

\u4e3e\u4f8b7\uff1a\u8868\u8fbe\u5f0f “\uffe5(\\d+\\.?\\d*)” \u5728\u5339\u914d “\uff0410.9,\uffe520.5″ \u65f6\uff0c\u5339\u914d\u7684\u7ed3\u679c\u662f\uff1a\u6210\u529f\uff1b\u5339\u914d\u5230\u7684<\/p>\n

\u5185\u5bb9\u662f\uff1a”\uffe520.5″\uff1b\u5339\u914d\u5230\u7684\u4f4d\u7f6e\u662f\uff1a\u5f00\u59cb\u4e8e6\uff0c\u7ed3\u675f\u4e8e10\u3002\u5355\u72ec\u83b7\u53d6\u62ec\u53f7\u8303\u56f4\u5339\u914d\u5230\u7684\u5185\u5bb9<\/p>\n

\u662f\uff1a”20.5″\u3002<\/p>\n

2. \u6b63\u5219\u8868\u8fbe\u5f0f\u4e2d\u7684\u4e00\u4e9b\u9ad8\u7ea7\u89c4\u5219<\/p>\n

2.1 \u5339\u914d\u6b21\u6570\u4e2d\u7684\u8d2a\u5a6a\u4e0e\u975e\u8d2a\u5a6a<\/p>\n

\u5728\u4f7f\u7528\u4fee\u9970\u5339\u914d\u6b21\u6570\u7684\u7279\u6b8a\u7b26\u53f7\u65f6\uff0c\u6709\u51e0\u79cd\u8868\u793a\u65b9\u6cd5\u53ef\u4ee5\u4f7f\u540c\u4e00\u4e2a\u8868\u8fbe\u5f0f\u80fd\u591f\u5339\u914d\u4e0d\u540c\u7684\u6b21\u6570\uff0c<\/p>\n

\u6bd4\u5982\uff1a”{m,n}”, “{m,}”, “?”, “*”, “+”\uff0c\u5177\u4f53\u5339\u914d\u7684\u6b21\u6570\u968f\u88ab\u5339\u914d\u7684\u5b57\u7b26\u4e32\u800c\u5b9a\u3002\u8fd9\u79cd\u91cd\u590d\u5339\u914d\u4e0d<\/p>\n

\u5b9a\u6b21\u6570\u7684\u8868\u8fbe\u5f0f\u5728\u5339\u914d\u8fc7\u7a0b\u4e2d\uff0c\u603b\u662f\u5c3d\u53ef\u80fd\u591a\u7684\u5339\u914d\u3002\u6bd4\u5982\uff0c\u9488\u5bf9\u6587\u672c “dxxxdxxxd”\uff0c\u4e3e\u4f8b\u5982\u4e0b\uff1a<\/p>\n

\u250f\u2501\u2501\u2501\u2501\u2501\u2501\u252f\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2513<\/p>\n

\u2503\u8868\u8fbe\u5f0f\u00a0\u00a0\u00a0\u00a0\u00a0 \u2502\u5339\u914d\u7ed3\u679c\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u2503<\/p>\n

\u2520\u2500\u2500\u2500\u2500\u2500\u2500\u253c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2528<\/p>\n

\u2503(d)(\\w+)\u00a0\u00a0\u00a0 \u2502”\\w+” \u5c06\u5339\u914d\u7b2c\u4e00\u4e2a “d” \u4e4b\u540e\u7684\u6240\u6709\u5b57\u7b26 “xxxdxxxd”\u2503<\/p>\n

\u2520\u2500\u2500\u2500\u2500\u2500\u2500\u253c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2528<\/p>\n

\u2503(d)(\\w+)(d) \u2502”\\w+” \u5c06\u5339\u914d\u7b2c\u4e00\u4e2a “d” \u548c\u6700\u540e\u4e00\u4e2a “d” \u4e4b\u95f4\u7684\u6240\u6709\u2503<\/p>\n

\u2503\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u2502\u5b57\u7b26 “xxxdxxx”\u3002\u867d\u7136 “\\w+” \u4e5f\u80fd\u591f\u5339\u914d\u4e0a\u6700\u540e\u4e00\u4e2a \u2503<\/p>\n

\u2503\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u2502”d”\uff0c\u4f46\u662f\u4e3a\u4e86\u4f7f\u6574\u4e2a\u8868\u8fbe\u5f0f\u5339\u914d\u6210\u529f\uff0c”\\w+” \u53ef\u4ee5 ” \u2503<\/p>\n

\u2503\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u2502\u8ba9\u51fa” \u5b83\u672c\u6765\u80fd\u591f\u5339\u914d\u7684\u6700\u540e\u4e00\u4e2a “d”\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u2503<\/p>\n

\u2517\u2501\u2501\u2501\u2501\u2501\u2501\u2537\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u251b<\/p>\n

\u7531\u6b64\u53ef\u89c1\uff0c”\\w+” \u5728\u5339\u914d\u7684\u65f6\u5019\uff0c\u603b\u662f\u5c3d\u53ef\u80fd\u591a\u7684\u5339\u914d\u7b26\u5408\u5b83\u89c4\u5219\u7684\u5b57\u7b26\u3002\u867d\u7136\u7b2c\u4e8c\u4e2a\u4e3e\u4f8b\u4e2d\uff0c<\/p>\n

\u5b83\u6ca1\u6709\u5339\u914d\u6700\u540e\u4e00\u4e2a “d”\uff0c\u4f46\u90a3\u4e5f\u662f\u4e3a\u4e86\u8ba9\u6574\u4e2a\u8868\u8fbe\u5f0f\u80fd\u591f\u5339\u914d\u6210\u529f\u3002\u540c\u7406\uff0c\u5e26 “*” \u548c “{m,n}” \u7684<\/p>\n

\u8868\u8fbe\u5f0f\u90fd\u662f\u5c3d\u53ef\u80fd\u5730\u591a\u5339\u914d\uff0c\u5e26 “?” \u7684\u8868\u8fbe\u5f0f\u5728\u53ef\u5339\u914d\u53ef\u4e0d\u5339\u914d\u7684\u65f6\u5019\uff0c\u4e5f\u662f\u5c3d\u53ef\u80fd\u7684 “\u8981\u5339\u914d”\u3002<\/p>\n

\u8fd9 \u79cd\u5339\u914d\u539f\u5219\u5c31\u53eb\u4f5c “\u8d2a\u5a6a” \u6a21\u5f0f \u3002<\/p>\n

\u975e\u8d2a\u5a6a\u6a21\u5f0f\uff1a<\/p>\n

\u5728\u4fee\u9970\u5339\u914d\u6b21\u6570\u7684\u7279\u6b8a\u7b26\u53f7\u540e\u518d\u52a0\u4e0a\u4e00\u4e2a “?” \u53f7\uff0c\u5219\u53ef\u4ee5\u4f7f\u5339\u914d\u6b21\u6570\u4e0d\u5b9a\u7684\u8868\u8fbe\u5f0f\u5c3d\u53ef\u80fd\u5c11\u7684\u5339<\/p>\n

\u914d\uff0c\u4f7f\u53ef\u5339\u914d\u53ef\u4e0d\u5339\u914d\u7684\u8868\u8fbe\u5f0f\uff0c\u5c3d\u53ef\u80fd\u7684 “\u4e0d\u5339\u914d”\u3002\u8fd9\u79cd\u5339\u914d\u539f\u5219\u53eb\u4f5c “\u975e\u8d2a\u5a6a” \u6a21\u5f0f\uff0c\u4e5f\u53eb\u4f5c ”<\/p>\n

\u52c9\u5f3a” \u6a21\u5f0f\u3002\u5982\u679c\u5c11\u5339\u914d\u5c31\u4f1a\u5bfc\u81f4\u6574\u4e2a\u8868\u8fbe\u5f0f\u5339\u914d\u5931\u8d25\u7684\u65f6\u5019\uff0c\u4e0e\u8d2a\u5a6a\u6a21\u5f0f\u7c7b\u4f3c\uff0c\u975e\u8d2a\u5a6a\u6a21\u5f0f\u4f1a\u6700\u5c0f<\/p>\n

\u9650\u5ea6\u7684\u518d\u5339\u914d\u4e00\u4e9b\uff0c\u4ee5\u4f7f\u6574\u4e2a\u8868\u8fbe\u5f0f\u5339\u914d\u6210\u529f\u3002\u4e3e\u4f8b\u5982\u4e0b\uff0c\u9488\u5bf9\u6587\u672c “dxxxdxxxd” \u4e3e\u4f8b\uff1a<\/p>\n

\u250f\u2501\u2501\u2501\u2501\u2501\u2501\u252f\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2513<\/p>\n

\u2503\u8868\u8fbe\u5f0f\u00a0\u00a0\u00a0\u00a0\u00a0 \u2502\u5339\u914d\u7ed3\u679c\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u2503<\/p>\n

\u2520\u2500\u2500\u2500\u2500\u2500\u2500\u253c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2528<\/p>\n

\u2503(d)(\\w+?)\u00a0\u00a0 \u2502”\\w+?” \u5c06\u5c3d\u53ef\u80fd\u5c11\u7684\u5339\u914d\u7b2c\u4e00\u4e2a “d” \u4e4b\u540e\u7684\u5b57\u7b26\uff0c\u7ed3\u679c\u662f\uff1a\u2503<\/p>\n

\u2503\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u2502”\\w+?” \u53ea\u5339\u914d\u4e86\u4e00\u4e2a “x”\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u2503<\/p>\n

\u2520\u2500\u2500\u2500\u2500\u2500\u2500\u253c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2528<\/p>\n

\u2503(d)(\\w+?)(d)\u2502\u4e3a\u4e86\u8ba9\u6574\u4e2a\u8868\u8fbe\u5f0f\u5339\u914d\u6210\u529f\uff0c”\\w+?” \u4e0d\u5f97\u4e0d\u5339\u914d “xxx”\u00a0\u00a0\u00a0\u00a0 \u2503<\/p>\n

\u2503\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u2502\u624d\u53ef\u4ee5\u8ba9\u540e\u8fb9\u7684”d” \u5339\u914d\uff0c\u4ece\u800c\u4f7f\u6574\u4e2a\u8868\u8fbe\u5f0f\u5339\u914d\u6210\u529f\u3002\u00a0\u00a0\u00a0 \u2503<\/p>\n

\u2503\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u2502\u56e0\u6b64\uff0c\u7ed3\u679c\u662f\uff1a”\\w+?” \u5339\u914d “xxx”\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u2503<\/p>\n

\u2517\u2501\u2501\u2501\u2501\u2501\u2501\u2537\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u251b<\/p>\n

\u66f4\u591a\u7684\u60c5\u51b5\uff0c\u4e3e\u4f8b\u5982\u4e0b\uff1a<\/p>\n

\u4e3e\u4f8b1\uff1a\u8868\u8fbe\u5f0f “<td>(.*)<\/td>” \u4e0e\u5b57\u7b26\u4e32 “<td><p>aa<\/p><\/td> <td><p>bb<\/p><\/td>” \u5339\u914d\u65f6<\/p>\n

\uff0c\u5339\u914d\u7684\u7ed3\u679c\u662f\uff1a\u6210\u529f\uff1b\u5339\u914d\u5230\u7684\u5185\u5bb9\u662f “<td><p>aa<\/p><\/td> <td><p>bb<\/p><\/td>” \u6574\u4e2a\u5b57\u7b26\u4e32\uff0c<\/p>\n

\u8868\u8fbe\u5f0f\u4e2d\u7684 “<\/td>” \u5c06\u4e0e\u5b57\u7b26\u4e32\u4e2d\u6700\u540e\u4e00\u4e2a “<\/td>” \u5339\u914d\u3002<\/p>\n

\u4e3e\u4f8b2\uff1a\u76f8\u6bd4\u4e4b\u4e0b\uff0c\u8868\u8fbe\u5f0f “<td>(.*?)<\/td>” \u5339\u914d\u4e3e\u4f8b1\u4e2d\u540c\u6837\u7684\u5b57\u7b26\u4e32\u65f6\uff0c\u5c06\u53ea\u5f97\u5230<\/p>\n

“<td><p>aa<\/p><\/td>”\uff0c \u518d\u6b21\u5339\u914d\u4e0b\u4e00\u4e2a\u65f6\uff0c\u53ef\u4ee5\u5f97\u5230\u7b2c\u4e8c\u4e2a “<td><p>bb<\/p><\/td>”\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

\u63ed\u5f00\u6b63\u5219\u8868\u8fbe\u5f0f\u7684\u795e\u79d8\u9762\u7eb1 \u5f15\u8a00 \u6b63\u5219\u8868\u8fbe\u5f0f\uff08regular expression\uff09\u63cf\u8ff0\u4e86\u4e00\u79cd\u5b57\u7b26\u4e32\u5339\u914d\u7684\u6a21\u5f0f\uff0c […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[],"class_list":["post-650","post","type-post","status-publish","format-standard","hentry","category-code_related"],"_links":{"self":[{"href":"https:\/\/kyle.ai\/blog\/wp-json\/wp\/v2\/posts\/650","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kyle.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kyle.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kyle.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/kyle.ai\/blog\/wp-json\/wp\/v2\/comments?post=650"}],"version-history":[{"count":1,"href":"https:\/\/kyle.ai\/blog\/wp-json\/wp\/v2\/posts\/650\/revisions"}],"predecessor-version":[{"id":5180,"href":"https:\/\/kyle.ai\/blog\/wp-json\/wp\/v2\/posts\/650\/revisions\/5180"}],"wp:attachment":[{"href":"https:\/\/kyle.ai\/blog\/wp-json\/wp\/v2\/media?parent=650"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kyle.ai\/blog\/wp-json\/wp\/v2\/categories?post=650"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kyle.ai\/blog\/wp-json\/wp\/v2\/tags?post=650"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}