{"id":458,"date":"2025-03-14T17:16:23","date_gmt":"2025-03-14T09:16:23","guid":{"rendered":"https:\/\/trantor.ink\/?p=458"},"modified":"2025-03-19T10:17:25","modified_gmt":"2025-03-19T02:17:25","slug":"%e6%ad%a3%e5%88%99%e8%a1%a8%e8%be%be%e5%bc%8f%e7%ae%80%e6%b4%81","status":"publish","type":"post","link":"https:\/\/trantor.ink\/?p=458","title":{"rendered":"\u6b63\u5219\u8868\u8fbe\u5f0f\u7b80\u4ecb"},"content":{"rendered":"\n

\u6b63\u5219\u8868\u8fbe\u5f0f\uff08Regular Expression, \u7b80\u79f0 Regex\uff09\u5168\u9762\u8be6\u89e3<\/strong><\/p>\n\n\n\n

\u6b63\u5219\u8868\u8fbe\u5f0f\uff08Regex\uff09\u662f\u4e00\u79cd\u5f3a\u5927\u7684\u6587\u672c\u5339\u914d\u5de5\u5177\uff0c\u5e7f\u6cdb\u5e94\u7528\u4e8e\u5b57\u7b26\u4e32\u641c\u7d22\u3001\u6587\u672c\u5904\u7406\u548c\u6570\u636e\u9a8c\u8bc1\u7b49\u573a\u666f\u3002\u5b83\u901a\u8fc7\u7279\u5b9a\u7684\u6a21\u5f0f\uff08pattern\uff09\u5339\u914d\u5b57\u7b26\u4e32\uff0c\u5e76\u652f\u6301\u590d\u6742\u7684\u641c\u7d22\u3001\u66ff\u6362\u548c\u89e3\u6790\u64cd\u4f5c\u3002<\/p>\n\n\n\n

\n\n\n\n

1. \u6b63\u5219\u8868\u8fbe\u5f0f\u7684\u57fa\u672c\u6982\u5ff5<\/strong><\/p>\n\n\n\n

1.1 \u6b63\u5219\u8868\u8fbe\u5f0f\u7684\u4f5c\u7528<\/strong><\/p>\n\n\n\n

\u2022 \u5b57\u7b26\u4e32\u5339\u914d<\/strong>\uff1a\u68c0\u67e5\u5b57\u7b26\u4e32\u662f\u5426\u7b26\u5408\u67d0\u79cd\u89c4\u5219\uff08\u5982\u90ae\u7bb1\u3001\u624b\u673a\u53f7\u7b49\uff09\u3002<\/p>\n\n\n\n

\u2022 \u641c\u7d22\u4e0e\u63d0\u53d6<\/strong>\uff1a\u4ece\u6587\u672c\u4e2d\u63d0\u53d6\u7279\u5b9a\u5185\u5bb9\uff08\u5982\u7f51\u9875\u722c\u53d6\u3001\u65e5\u5fd7\u5206\u6790\uff09\u3002<\/p>\n\n\n\n

\u2022 \u66ff\u6362\u4e0e\u683c\u5f0f\u5316<\/strong>\uff1a\u4f7f\u7528\u6a21\u5f0f\u5339\u914d\u66ff\u6362\u5b57\u7b26\u4e32\u4e2d\u7684\u5185\u5bb9\uff08\u5982\u53bb\u9664\u591a\u4f59\u7a7a\u683c\uff09\u3002<\/p>\n\n\n\n

1.2 \u5e38\u89c1\u7684\u6b63\u5219\u8868\u8fbe\u5f0f\u8bed\u6cd5<\/strong><\/p>\n\n\n\n

\u6b63\u5219\u8868\u8fbe\u5f0f\u7531\u666e\u901a\u5b57\u7b26<\/strong>\u548c**\u5143\u5b57\u7b26\uff08Metacharacters\uff09**\u7ec4\u6210\u3002<\/p>\n\n\n\n

\u666e\u901a\u5b57\u7b26\u4f1a\u88ab\u76f4\u63a5\u5339\u914d\uff0c\u800c\u5143\u5b57\u7b26\u7528\u4e8e\u5b9a\u4e49\u5339\u914d\u89c4\u5219\u3002<\/p>\n\n\n\n

\n\n\n\n

2. \u6b63\u5219\u8868\u8fbe\u5f0f\u7684\u57fa\u7840\u8bed\u6cd5<\/strong><\/p>\n\n\n\n

2.1 \u666e\u901a\u5b57\u7b26\u5339\u914d<\/strong><\/p>\n\n\n\n

\u666e\u901a\u5b57\u7b26\uff08\u5982 a, b, c\uff09\u5728\u6b63\u5219\u8868\u8fbe\u5f0f\u4e2d\u5339\u914d\u81ea\u8eab\u3002\u4f8b\u5982\uff1a<\/p>\n\n\n\n

hello<\/pre>\n\n\n\n
\u5339\u914d\u5b57\u7b26\u4e32 “hello”\u3002<\/p>\n\n\n\n
\n\n\n\n
2.2 \u7279\u6b8a\u5b57\u7b26\uff08\u5143\u5b57\u7b26\uff09<\/strong><\/p>\n\n\n\n
\u6b63\u5219\u8868\u8fbe\u5f0f\u5305\u542b\u591a\u4e2a\u5143\u5b57\u7b26\uff0c\u5b83\u4eec\u6709\u7279\u6b8a\u7684\u610f\u4e49\uff1a<\/p>\n\n\n\n
\u5143\u5b57\u7b26<\/strong><\/th>\u8bf4\u660e<\/strong><\/th>\u793a\u4f8b<\/strong><\/th><\/tr><\/thead>
.<\/td>\u4efb\u610f\u5355\u4e2a\u5b57\u7b26\uff08\u4e0d\u5305\u62ec\u6362\u884c\uff09<\/td>a.b \u53ef\u5339\u914d “a1b”, “a_b”\uff0c\u4f46\u4e0d\u80fd\u5339\u914d “ab”<\/td><\/tr>
\\d<\/td>\u4efb\u610f\u6570\u5b57\uff08\u7b49\u4ef7\u4e8e [0-9]\uff09<\/td>\\d{3} \u53ef\u5339\u914d “123”<\/td><\/tr>
\\D<\/td>\u4efb\u610f\u975e\u6570\u5b57\u5b57\u7b26\uff08\u7b49\u4ef7\u4e8e [^0-9]\uff09<\/td>\\D \u53ef\u5339\u914d “a”\uff0c\u4f46\u4e0d\u80fd\u5339\u914d “1”<\/td><\/tr>
\\w<\/td>\u4efb\u610f\u5b57\u6bcd\u3001\u6570\u5b57\u6216\u4e0b\u5212\u7ebf\uff08\u7b49\u4ef7\u4e8e [a-zA-Z0-9_]\uff09<\/td>\\w+ \u53ef\u5339\u914d “hello_123”<\/td><\/tr>
\\W<\/td>\u975e\u5b57\u6bcd\u3001\u6570\u5b57\u3001\u4e0b\u5212\u7ebf\uff08\u7b49\u4ef7\u4e8e [^a-zA-Z0-9_]\uff09<\/td>\\W \u53ef\u5339\u914d “@”<\/td><\/tr>
\\s<\/td>\u4efb\u4f55\u7a7a\u767d\u5b57\u7b26\uff08\u7a7a\u683c\u3001\u5236\u8868\u7b26\u3001\u6362\u884c\u7b26\uff09<\/td>\\s+ \u53ef\u5339\u914d ”   “<\/td><\/tr>
\\S<\/td>\u4efb\u4f55\u975e\u7a7a\u767d\u5b57\u7b26<\/td>\\S+ \u53ef\u5339\u914d “hello”<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
\n\n\n\n
2.3 \u91cd\u590d\u5339\u914d\uff08\u91cf\u8bcd\uff09<\/strong><\/p>\n\n\n\n
\u91cf\u8bcd\u7528\u4e8e\u6307\u5b9a\u67d0\u4e2a\u6a21\u5f0f\u51fa\u73b0\u7684\u6b21\u6570\uff1a<\/p>\n\n\n\n
\u91cf\u8bcd<\/strong><\/th>\u8bf4\u660e<\/strong><\/th>\u793a\u4f8b<\/strong><\/th><\/tr><\/thead>
*<\/td>0 \u6b21\u6216\u591a\u6b21<\/td>a* \u53ef\u5339\u914d “a”, “aa”, “”<\/td><\/tr>
+<\/td>1 \u6b21\u6216\u591a\u6b21<\/td>a+ \u53ef\u5339\u914d “a”, “aa”\uff0c\u4f46\u4e0d\u80fd\u5339\u914d “”<\/td><\/tr>
?<\/td>0 \u6b21\u6216 1 \u6b21<\/td>a? \u53ef\u5339\u914d “a” \u6216 “”<\/td><\/tr>
{n}<\/td>\u6b63\u597d n \u6b21<\/td>\\d{3} \u53ea\u80fd\u5339\u914d “123”\uff0c\u4e0d\u80fd\u5339\u914d “12”<\/td><\/tr>
{n,}<\/td>\u81f3\u5c11 n \u6b21<\/td>\\d{2,} \u53ef\u5339\u914d “12”, “1234”<\/td><\/tr>
{n,m}<\/td>n \u5230 m \u6b21<\/td>\\d{2,4} \u53ef\u5339\u914d “12”, “123”, “1234”<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
\n\n\n\n
2.4 \u8fb9\u754c\u5339\u914d<\/strong><\/p>\n\n\n\n
\u8fb9\u754c\u5339\u914d\u7528\u4e8e\u786e\u5b9a\u5339\u914d\u7684\u4f4d\u7f6e\uff1a<\/p>\n\n\n\n
\u8fb9\u754c\u7b26<\/strong><\/th>\u8bf4\u660e<\/strong><\/th>\u793a\u4f8b<\/strong><\/th><\/tr><\/thead>
^<\/td>\u5339\u914d\u5b57\u7b26\u4e32\u5f00\u5934<\/td>^abc \u53ea\u80fd\u5339\u914d “abc”\uff0c\u4e0d\u80fd\u5339\u914d “xyzabc”<\/td><\/tr>
$<\/td>\u5339\u914d\u5b57\u7b26\u4e32\u7ed3\u5c3e<\/td>xyz$ \u53ea\u80fd\u5339\u914d “abcxyz”\uff0c\u4e0d\u80fd\u5339\u914d “xyzabc”<\/td><\/tr>
\\b<\/td>\u5355\u8bcd\u8fb9\u754c<\/td>\\bcat\\b \u53ea\u5339\u914d ” cat “\uff0c\u4f46\u4e0d\u5339\u914d “cater”<\/td><\/tr>
\\B<\/td>\u975e\u5355\u8bcd\u8fb9\u754c<\/td>\\Bcat\\B \u53ef\u5339\u914d “scattering”<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
\n\n\n\n
2.5 \u5206\u7ec4\u4e0e\u5f15\u7528<\/strong><\/p>\n\n\n\n
\u5206\u7ec4<\/strong>\u7528\u4e8e\u63d0\u53d6\u5b50\u6a21\u5f0f\uff0c\u53cd\u5411\u5f15\u7528<\/strong>\u7528\u4e8e\u5339\u914d\u524d\u9762\u6355\u83b7\u7684\u5185\u5bb9\u3002<\/p>\n\n\n\n
\u8bed\u6cd5<\/strong><\/th>\u8bf4\u660e<\/strong><\/th>\u793a\u4f8b<\/strong><\/th><\/tr><\/thead>
( )<\/td>\u6355\u83b7\u7ec4<\/td>(ab)+ \u53ef\u5339\u914d “abab”<\/td><\/tr>
(?: )<\/td>\u975e\u6355\u83b7\u7ec4<\/td>(?:ab)+ \u4e5f\u5339\u914d “abab”\uff0c\u4f46\u4e0d\u4f1a\u5b58\u50a8\u5339\u914d\u5185\u5bb9<\/td><\/tr>
\\1, \\2…<\/td>\u53cd\u5411\u5f15\u7528<\/td>(\\w)\\1 \u53ef\u5339\u914d “aa”, “bb”<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
\n\n\n\n
2.6 \u5b57\u7b26\u96c6\uff08\u5b57\u7b26\u7c7b\uff09<\/strong><\/p>\n\n\n\n
\u5b57\u7b26\u96c6\u7528\u4e8e\u5339\u914d\u67d0\u4e00\u7c7b\u5b57\u7b26\u3002<\/p>\n\n\n\n
\u8bed\u6cd5<\/strong><\/th>\u8bf4\u660e<\/strong><\/th>\u793a\u4f8b<\/strong><\/th><\/tr><\/thead>
[abc]<\/td>\u5339\u914d a, b, c \u4e4b\u4e00<\/td>[aeiou] \u5339\u914d\u4efb\u4f55\u5143\u97f3<\/td><\/tr>
[^abc]<\/td>\u5339\u914d\u975e a, b, c \u4e4b\u4e00<\/td>[^0-9] \u5339\u914d\u975e\u6570\u5b57<\/td><\/tr>
[a-z]<\/td>\u5339\u914d\u5c0f\u5199\u5b57\u6bcd<\/td>[A-Z] \u5339\u914d\u5927\u5199\u5b57\u6bcd<\/td><\/tr>
[0-9]<\/td>\u5339\u914d\u6570\u5b57<\/td>[0-9A-F] \u5339\u914d\u5341\u516d\u8fdb\u5236\u5b57\u7b26<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
\n\n\n\n
3. \u8fdb\u9636\u7528\u6cd5<\/strong><\/p>\n\n\n\n
3.1 \u65ad\u8a00\uff08\u96f6\u5bbd\u5ea6\u5339\u914d\uff09<\/strong><\/p>\n\n\n\n
\u65ad\u8a00\u7528\u4e8e\u5339\u914d\u524d\u540e\u73af\u5883\uff0c\u800c\u4e0d\u6d88\u8017\u5b57\u7b26\u3002<\/p>\n\n\n\n
\u8bed\u6cd5<\/strong><\/th>\u8bf4\u660e<\/strong><\/th>\u793a\u4f8b<\/strong><\/th><\/tr><\/thead>
(?=exp)<\/td>\u6b63\u5411\u5148\u884c\u65ad\u8a00<\/td>\\d(?=px) \u5339\u914d “3px” \u4e2d\u7684 “3”<\/td><\/tr>
(?!exp)<\/td>\u8d1f\u5411\u5148\u884c\u65ad\u8a00<\/td>\\d(?!px) \u5339\u914d “3cm” \u4e2d\u7684 “3”<\/td><\/tr>
(?<=exp)<\/td>\u6b63\u5411\u540e\u884c\u65ad\u8a00<\/td>(?<=\\$)\\d+ \u5339\u914d “$100” \u4e2d\u7684 “100”<\/td><\/tr>
(?<!exp)<\/td>\u8d1f\u5411\u540e\u884c\u65ad\u8a00<\/td>(?<!\\$)\\d+ \u5339\u914d “100”\uff0c\u4f46\u4e0d\u5339\u914d “$100”<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
\n\n\n\n
3.2 \u8d2a\u5a6a\u4e0e\u61d2\u60f0\u5339\u914d<\/strong><\/p>\n\n\n\n
\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u91cf\u8bcd\u662f\u8d2a\u5a6a<\/strong>\u7684\uff08\u5c3d\u53ef\u80fd\u591a\u5339\u914d\uff09\u3002<\/p>\n\n\n\n
\u8bed\u6cd5<\/strong><\/th>\u8bf4\u660e<\/strong><\/th>\u793a\u4f8b<\/strong><\/th><\/tr><\/thead>
.*<\/td>\u8d2a\u5a6a\u5339\u914d<\/td>“<b>text<\/b>” \u5339\u914d “<b>text<\/b>”<\/td><\/tr>
.*?<\/td>\u61d2\u60f0\u5339\u914d<\/td>“<b>text<\/b>” \u53ea\u5339\u914d “<b>”<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
\n\n\n\n
4. \u5e38\u89c1\u6b63\u5219\u8868\u8fbe\u5f0f\u793a\u4f8b<\/strong><\/p>\n\n\n\n
\u4efb\u52a1<\/strong><\/th>\u6b63\u5219\u8868\u8fbe\u5f0f<\/strong><\/th><\/tr><\/thead>
\u5339\u914d\u90ae\u7bb1<\/strong><\/td>^\\w+([.-]?\\w+)*@\\w+([.-]?\\w+)*\\.\\w+$<\/td><\/tr>
\u5339\u914d\u624b\u673a\u53f7\uff08\u4e2d\u56fd\uff09<\/strong><\/td>^1[3-9]\\d{9}$<\/td><\/tr>
\u5339\u914d IPv4 \u5730\u5740<\/strong><\/td>\\b(?:\\d{1,3}\\.){3}\\d{1,3}\\b<\/td><\/tr>
\u5339\u914d\u65e5\u671f\uff08YYYY-MM-DD\uff09<\/strong><\/td>^\\d{4}-\\d{2}-\\d{2}$<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
\n\n\n\n
\u603b\u7ed3<\/strong><\/p>\n\n\n\n
\u6b63\u5219\u8868\u8fbe\u5f0f\u662f\u4e00\u79cd\u5f3a\u5927\u4f46\u590d\u6742\u7684\u5de5\u5177\uff0c\u638c\u63e1\u5b83\u53ef\u4ee5\u6781\u5927\u63d0\u9ad8\u6587\u672c\u5904\u7406\u6548\u7387\u3002\u5efa\u8bae\u901a\u8fc7**\u5728\u7ebf\u5de5\u5177\uff08\u5982 regex101\uff09**\u6d4b\u8bd5\u4e0d\u540c\u8868\u8fbe\u5f0f\uff0c\u4ee5\u52a0\u6df1\u7406\u89e3\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u6b63\u5219\u8868\u8fbe\u5f0f\uff08Regular Expression, \u7b80\u79f0 Regex\uff09\u5168\u9762\u8be6\u89e3 \u6b63\u5219\u8868\u8fbe\u5f0f\uff08Regex\uff09\u662f\u4e00\u79cd\u5f3a\u5927\u7684\u6587\u672c\u5339\u914d\u5de5\u5177\uff0c\u5e7f\u6cdb\u5e94\u7528\u4e8e\u5b57\u7b26\u4e32\u641c\u7d22\u3001\u6587\u672c\u5904\u7406\u548c\u6570\u636e\u9a8c\u8bc1\u7b49\u573a\u666f\u3002\u5b83\u901a\u8fc7\u7279\u5b9a\u7684\u6a21\u5f0f\uff08pattern\uff09\u5339\u914d\u5b57\u7b26\u4e32\uff0c\u5e76\u652f\u6301\u590d\u6742\u7684\u641c\u7d22\u3001\u66ff\u6362\u548c\u89e3\u6790\u64cd\u4f5c\u3002 1. \u6b63\u5219\u8868\u8fbe\u5f0f\u7684\u57fa\u672c\u6982\u5ff5 1.1 \u6b63\u5219\u8868\u8fbe\u5f0f\u7684\u4f5c\u7528 \u2022 \u5b57\u7b26\u4e32\u5339\u914d\uff1a\u68c0\u67e5\u5b57\u7b26\u4e32\u662f\u5426\u7b26\u5408\u67d0\u79cd\u89c4\u5219\uff08\u5982\u90ae\u7bb1\u3001\u624b\u673a\u53f7\u7b49\uff09\u3002 \u2022 \u641c\u7d22\u4e0e\u63d0\u53d6\uff1a\u4ece\u6587\u672c\u4e2d\u63d0\u53d6\u7279\u5b9a\u5185\u5bb9\uff08\u5982\u7f51\u9875\u722c\u53d6\u3001\u65e5\u5fd7\u5206\u6790\uff09\u3002 \u2022 \u66ff\u6362\u4e0e\u683c\u5f0f\u5316\uff1a\u4f7f\u7528\u6a21\u5f0f\u5339\u914d\u66ff\u6362\u5b57\u7b26\u4e32\u4e2d\u7684\u5185\u5bb9\uff08\u5982\u53bb\u9664\u591a\u4f59\u7a7a\u683c\uff09\u3002 1.2 \u5e38\u89c1\u7684\u6b63\u5219\u8868\u8fbe\u5f0f\u8bed\u6cd5 \u6b63\u5219\u8868\u8fbe\u5f0f\u7531\u666e\u901a\u5b57\u7b26\u548c**\u5143\u5b57\u7b26\uff08Metacharacters\uff09**\u7ec4\u6210\u3002 \u666e\u901a\u5b57\u7b26\u4f1a\u88ab\u76f4\u63a5\u5339\u914d\uff0c\u800c\u5143\u5b57\u7b26\u7528\u4e8e\u5b9a\u4e49\u5339\u914d\u89c4\u5219\u3002 2. \u6b63\u5219\u8868\u8fbe\u5f0f\u7684\u57fa\u7840\u8bed\u6cd5 2.1 \u666e\u901a\u5b57\u7b26\u5339\u914d \u666e\u901a\u5b57\u7b26\uff08\u5982 a, b, c\uff09\u5728\u6b63\u5219\u8868\u8fbe\u5f0f\u4e2d\u5339\u914d\u81ea\u8eab\u3002\u4f8b\u5982\uff1a \u5339\u914d\u5b57\u7b26\u4e32 “hello”\u3002 2.2 \u7279\u6b8a\u5b57\u7b26\uff08\u5143\u5b57\u7b26\uff09 \u6b63\u5219\u8868\u8fbe\u5f0f\u5305\u542b\u591a\u4e2a\u5143\u5b57\u7b26\uff0c\u5b83\u4eec\u6709\u7279\u6b8a\u7684\u610f\u4e49\uff1a \u5143\u5b57\u7b26 \u8bf4\u660e \u793a\u4f8b . \u4efb\u610f\u5355\u4e2a\u5b57\u7b26\uff08\u4e0d\u5305\u62ec\u6362\u884c\uff09 a.b \u53ef\u5339\u914d “a1b”, “a_b”\uff0c\u4f46\u4e0d\u80fd\u5339\u914d “ab” \\d \u4efb\u610f\u6570\u5b57\uff08\u7b49\u4ef7\u4e8e [0-9]\uff09 \\d{3} \u53ef\u5339\u914d “123” \\D \u4efb\u610f\u975e\u6570\u5b57\u5b57\u7b26\uff08\u7b49\u4ef7\u4e8e [^0-9]\uff09 \\D \u53ef\u5339\u914d “a”\uff0c\u4f46\u4e0d\u80fd\u5339\u914d “1” \\w \u4efb\u610f\u5b57\u6bcd\u3001\u6570\u5b57\u6216\u4e0b\u5212\u7ebf\uff08\u7b49\u4ef7\u4e8e [a-zA-Z0-9_]\uff09 \\w+ \u53ef\u5339\u914d “hello_123” \\W \u975e\u5b57\u6bcd\u3001\u6570\u5b57\u3001\u4e0b\u5212\u7ebf\uff08\u7b49\u4ef7\u4e8e [^a-zA-Z0-9_]\uff09 \\W \u53ef\u5339\u914d “@” \\s \u4efb\u4f55\u7a7a\u767d\u5b57\u7b26\uff08\u7a7a\u683c\u3001\u5236\u8868\u7b26\u3001\u6362\u884c\u7b26\uff09 \\s+ \u53ef\u5339\u914d ”   “ \\S \u4efb\u4f55\u975e\u7a7a\u767d\u5b57\u7b26 \\S+ \u53ef\u5339\u914d “hello” 2.3 \u91cd\u590d\u5339\u914d\uff08\u91cf\u8bcd\uff09 \u91cf\u8bcd\u7528\u4e8e\u6307\u5b9a\u67d0\u4e2a\u6a21\u5f0f\u51fa\u73b0\u7684\u6b21\u6570\uff1a \u91cf\u8bcd \u8bf4\u660e \u793a\u4f8b * 0 \u6b21\u6216\u591a\u6b21 a* \u53ef\u5339\u914d “a”, “aa”, “” + 1 \u6b21\u6216\u591a\u6b21 a+ \u53ef\u5339\u914d “a”, “aa”\uff0c\u4f46\u4e0d\u80fd\u5339\u914d “” ? 0 \u6b21\u6216 1 \u6b21 a? \u53ef\u5339\u914d “a” \u6216 “” {n} \u6b63\u597d n \u6b21 \\d{3} \u53ea\u80fd\u5339\u914d “123”\uff0c\u4e0d\u80fd\u5339\u914d “12” {n,} \u81f3\u5c11 n \u6b21 \\d{2,} \u53ef\u5339\u914d “12”, “1234” {n,m} n \u5230 m \u6b21 \\d{2,4} \u53ef\u5339\u914d “12”, “123”, “1234” 2.4 \u8fb9\u754c\u5339\u914d \u8fb9\u754c\u5339\u914d\u7528\u4e8e\u786e\u5b9a\u5339\u914d\u7684\u4f4d\u7f6e\uff1a \u8fb9\u754c\u7b26 \u8bf4\u660e \u793a\u4f8b ^ \u5339\u914d\u5b57\u7b26\u4e32\u5f00\u5934 ^abc \u53ea\u80fd\u5339\u914d “abc”\uff0c\u4e0d\u80fd\u5339\u914d “xyzabc” $ \u5339\u914d\u5b57\u7b26\u4e32\u7ed3\u5c3e xyz$ \u53ea\u80fd\u5339\u914d “abcxyz”\uff0c\u4e0d\u80fd\u5339\u914d “xyzabc” \\b \u5355\u8bcd\u8fb9\u754c \\bcat\\b \u53ea\u5339\u914d ” cat “\uff0c\u4f46\u4e0d\u5339\u914d “cater” \\B \u975e\u5355\u8bcd\u8fb9\u754c \\Bcat\\B \u53ef\u5339\u914d “scattering” 2.5 \u5206\u7ec4\u4e0e\u5f15\u7528 \u5206\u7ec4\u7528\u4e8e\u63d0\u53d6\u5b50\u6a21\u5f0f\uff0c\u53cd\u5411\u5f15\u7528\u7528\u4e8e\u5339\u914d\u524d\u9762\u6355\u83b7\u7684\u5185\u5bb9\u3002 \u8bed\u6cd5 \u8bf4\u660e \u793a\u4f8b ( ) \u6355\u83b7\u7ec4 (ab)+ \u53ef\u5339\u914d “abab” (?: ) \u975e\u6355\u83b7\u7ec4 (?:ab)+ \u4e5f\u5339\u914d “abab”\uff0c\u4f46\u4e0d\u4f1a\u5b58\u50a8\u5339\u914d\u5185\u5bb9 \\1, \\2… \u53cd\u5411\u5f15\u7528 (\\w)\\1 \u53ef\u5339\u914d “aa”, “bb” 2.6 \u5b57\u7b26\u96c6\uff08\u5b57\u7b26\u7c7b\uff09 \u5b57\u7b26\u96c6\u7528\u4e8e\u5339\u914d\u67d0\u4e00\u7c7b\u5b57\u7b26\u3002 \u8bed\u6cd5 \u8bf4\u660e \u793a\u4f8b [abc] \u5339\u914d a, b, c \u4e4b\u4e00 [aeiou] \u5339\u914d\u4efb\u4f55\u5143\u97f3 [^abc] \u5339\u914d\u975e a, b, c \u4e4b\u4e00 [^0-9] \u5339\u914d\u975e\u6570\u5b57 [a-z] \u5339\u914d\u5c0f\u5199\u5b57\u6bcd [A-Z] \u5339\u914d\u5927\u5199\u5b57\u6bcd [0-9] \u5339\u914d\u6570\u5b57 [0-9A-F] \u5339\u914d\u5341\u516d\u8fdb\u5236\u5b57\u7b26 3. \u8fdb\u9636\u7528\u6cd5 3.1 \u65ad\u8a00\uff08\u96f6\u5bbd\u5ea6\u5339\u914d\uff09 \u65ad\u8a00\u7528\u4e8e\u5339\u914d\u524d\u540e\u73af\u5883\uff0c\u800c\u4e0d\u6d88\u8017\u5b57\u7b26\u3002 \u8bed\u6cd5 \u8bf4\u660e \u793a\u4f8b (?=ex…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[17],"tags":[59],"class_list":["post-458","post","type-post","status-publish","format-standard","hentry","category-dev","tag-regex"],"_links":{"self":[{"href":"https:\/\/trantor.ink\/index.php?rest_route=\/wp\/v2\/posts\/458","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/trantor.ink\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/trantor.ink\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/trantor.ink\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/trantor.ink\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=458"}],"version-history":[{"count":3,"href":"https:\/\/trantor.ink\/index.php?rest_route=\/wp\/v2\/posts\/458\/revisions"}],"predecessor-version":[{"id":463,"href":"https:\/\/trantor.ink\/index.php?rest_route=\/wp\/v2\/posts\/458\/revisions\/463"}],"wp:attachment":[{"href":"https:\/\/trantor.ink\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=458"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/trantor.ink\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=458"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/trantor.ink\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=458"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}