\u5b57\u7b26\u7c7b<\/strong><\/h4>\n[abc]\u00a0\u5339\u914d\u00a0a\u3001b\u00a0\u6216\u00a0c\u00a0\u4e2d\u7684\u4efb\u4f55\u4e00\u4e2a\u5b57\u7b26\u3002<\/p>\n
[a-z]\u00a0\u5339\u914d\u4efb\u4f55\u4e00\u4e2a\u5c0f\u5199\u5b57\u6bcd\u3002<\/p>\n
[0-9]\u00a0\u5339\u914d\u4efb\u4f55\u4e00\u4e2a\u6570\u5b57\u3002<\/p>\n
\u9884\u5b9a\u4e49\u5b57\u7b26\u7c7b\uff1a<\/p>\n
\\d\u00a0\u5339\u914d\u4efb\u4f55\u4e00\u4e2a\u6570\u5b57\u3002<\/p>\n
\\w\u00a0\u5339\u914d\u4efb\u4f55\u4e00\u4e2a\u5b57\u6bcd\u6570\u5b57\u5b57\u7b26\u3002<\/p>\n
\\s\u00a0\u5339\u914d\u4efb\u4f55\u4e00\u4e2a\u7a7a\u767d\u5b57\u7b26\u3002<\/p>\n
\u91cf\u8bcd\uff1a<\/p>\n
*\u00a0\u5339\u914d\u524d\u9762\u7684\u5143\u7d20\u96f6\u6b21\u6216\u591a\u6b21\u3002<\/p>\n
+\u00a0\u5339\u914d\u524d\u9762\u7684\u5143\u7d20\u4e00\u6b21\u6216\u591a\u6b21\u3002<\/p>\n
?\u00a0\u5339\u914d\u524d\u9762\u7684\u5143\u7d20\u96f6\u6b21\u6216\u4e00\u6b21\u3002<\/p>\n
{n}\u00a0\u5339\u914d\u524d\u9762\u7684\u5143\u7d20\u6070\u597d n \u6b21\u3002<\/p>\n
{n,}\u00a0\u5339\u914d\u524d\u9762\u7684\u5143\u7d20\u81f3\u5c11 n \u6b21\u3002<\/p>\n
{n,m}\u00a0\u5339\u914d\u524d\u9762\u7684\u5143\u7d20\u81f3\u5c11 n \u6b21\uff0c\u81f3\u591a m \u6b21\u3002<\/p>\n
\u5b9a\u4f4d\u7b26<\/p>\n
^\u00a0\u5339\u914d\u5b57\u7b26\u4e32\u7684\u5f00\u59cb\u3002<\/p>\n
$\u00a0\u5339\u914d\u5b57\u7b26\u4e32\u7684\u7ed3\u675f\u3002<\/p>\n
\\b\u00a0\u5339\u914d\u5355\u8bcd\u8fb9\u754c\u3002<\/p>\n
\\B\u00a0\u5339\u914d\u975e\u5355\u8bcd\u8fb9\u754c\u3002<\/p>\n
\u5206\u7ec4\u548c\u5f15\u7528<\/p>\n
()\u00a0\u7528\u4e8e\u5206\u7ec4\u3002<\/p>\n
\\1,\u00a0\\2, … \u7528\u4e8e\u5f15\u7528\u524d\u9762\u7684\u5206\u7ec4\u3002<\/p>\n
\u9009\u62e9\uff1a<\/p>\n
|\u00a0\u8868\u793a\u201c\u6216\u201d\uff0c\u5339\u914d\u5de6\u8fb9\u6216\u53f3\u8fb9\u7684\u8868\u8fbe\u5f0f\u3002<\/p>\n
\u901a\u914d\u7b26<\/h4>\n
\u661f\u53f7 (*)\uff1a\u5339\u914d\u4efb\u610f\u6570\u91cf\u7684\u4efb\u610f\u5b57\u7b26\u3002<\/p>\n
\u95ee\u53f7 (?)\uff1a\u5339\u914d\u5355\u4e2a\u4efb\u610f\u5b57\u7b26\u3002<\/p>\n
\u65b9\u62ec\u53f7 ([])\uff1a\u5339\u914d\u62ec\u53f7\u5185\u7684\u4efb\u610f\u4e00\u4e2a\u5b57\u7b26\u3002<\/p>\n
[abc]\u00a0\u5339\u914d\u00a0a\u3001b\u00a0\u6216\u00a0c\u00a0\u4e2d\u7684\u4efb\u4f55\u4e00\u4e2a\u5b57\u7b26\u3002<\/p>\n
[a-z]\u00a0\u5339\u914d\u4efb\u4f55\u4e00\u4e2a\u5c0f\u5199\u5b57\u6bcd\u3002<\/p>\n
[0-9]\u00a0\u5339\u914d\u4efb\u4f55\u4e00\u4e2a\u6570\u5b57\u3002<\/p>\n
\u8303\u56f4\u548c\u5426\u5b9a\uff1a<\/p>\n
[^abc]\u00a0\u5339\u914d\u9664\u00a0a\u3001b\u3001c\u00a0\u4e4b\u5916\u7684\u4efb\u4f55\u5b57\u7b26\u3002<\/p>\n
[!abc]\u00a0\u540c\u4e0a\uff0c\u67d0\u4e9b\u7cfb\u7edf\u4e2d\u4f7f\u7528\u00a0!\u00a0\u8868\u793a\u5426\u5b9a\u3002<\/p>\n
\u4f7f\u7528\u573a\u666f<\/h2>\n\u6b63\u5219\u8868\u8fbe\u5f0f<\/h4>\n
\u6587\u672c\u5904\u7406\uff1a\u5728\u7f16\u7a0b\u4e2d\u5bf9\u7528\u6237\u8f93\u5165\u7684\u6570\u636e\u8fdb\u884c\u683c\u5f0f\u6821\u9a8c\uff0c\u5982\u9a8c\u8bc1\u7535\u5b50\u90ae\u4ef6\u5730\u5740\u3001\u7535\u8bdd\u53f7\u7801\u7b49\u3002<\/p>\n
\u641c\u7d22\u548c\u66ff\u6362\uff1a\u5728\u6587\u672c\u7f16\u8f91\u5668\u4e2d\u8fdb\u884c\u590d\u6742\u7684\u641c\u7d22\u548c\u66ff\u6362\u64cd\u4f5c\u3002<\/p>\n
\u6570\u636e\u63d0\u53d6\uff1a\u4ece\u65e5\u5fd7\u6587\u4ef6\u6216\u5176\u4ed6\u6587\u672c\u6570\u636e\u4e2d\u63d0\u53d6\u7279\u5b9a\u4fe1\u606f\u3002<\/p>\n
\u901a\u914d\u7b26<\/h4>\n
\u6587\u4ef6\u540d\u5339\u914d\uff1a\u5728\u547d\u4ee4\u884c\u754c\u9762\u4e2d\u7528\u4e8e\u6307\u5b9a\u4e00\u7ec4\u6587\u4ef6\u540d\uff0c\u5982\u00a0*.txt\u00a0\u5339\u914d\u6240\u6709\u6269\u5c55\u540d\u4e3a\u00a0.txt\u00a0\u7684\u6587\u4ef6\u3002<\/p>\n
\u8def\u5f84\u5339\u914d\uff1a\u5728\u6587\u4ef6\u7cfb\u7edf\u4e2d\u7528\u4e8e\u5339\u914d\u76ee\u5f55\u8def\u5f84\uff0c\u5982\u00a0*.\/*\/*.jpg\u00a0\u5339\u914d\u6240\u6709\u5b50\u76ee\u5f55\u4e2d\u7684\u00a0.jpg\u00a0\u6587\u4ef6\u3002<\/p>\n
\u6b63\u5219\u8868\u8fbe\u5f0f<\/strong>\uff1a<\/p>\n\u80fd\u5b9e\u73b0\u9ad8\u5ea6\u7cbe\u786e\u5339\u914d\u3002\u53ef\u5bf9\u6587\u672c\u4e2d\u5b57\u7b26\u4f4d\u7f6e\u3001\u51fa\u73b0\u6b21\u6570\u3001\u7ec4\u5408\u65b9\u5f0f\u7b49\u8fdb\u884c\u7ec6\u81f4\u89c4\u5b9a\u3002<\/p>\n
\u4e0d\u4ec5\u80fd\u5339\u914d\u5b57\u7b26\u672c\u8eab\uff0c\u8fd8\u80fd\u5339\u914d\u6ee1\u8db3\u7279\u5b9a\u6761\u4ef6\u7684\u5b57\u7b26\u4e32\u96c6\u5408\uff0c\u5982\u4ee5\u67d0\u7279\u5b9a\u5b57\u7b26\u4e32\u5f00\u5934\u4e14\u4ee5\u53e6\u4e00\u7279\u5b9a\u5b57\u7b26\u4e32\u7ed3\u5c3e\uff0c\u4e2d\u95f4\u542b\u7279\u5b9a\u683c\u5f0f\u5b57\u7b26\u7684\u6587\u672c\u7b49\u590d\u6742\u60c5\u51b5\u3002<\/p>\n
\u4f8b\u5982\uff0c\u201c\\d {3}-\\d {3}-\\d {4}\u201d \u53ef\u7cbe\u786e\u5339\u914d\u7f8e\u56fd\u7535\u8bdd\u53f7\u7801\u683c\u5f0f\uff08\u4e09\u4e2a\u6570\u5b57 – \u4e09\u4e2a\u6570\u5b57 – \u56db\u4e2a\u6570\u5b57\uff09\uff0c\u901a\u8fc7\u91cf\u8bcd \u201c{n}\u201d \u7cbe\u51c6\u9650\u5b9a\u6570\u5b57\u51fa\u73b0\u6b21\u6570\u3002<\/p>\n
\u901a\u914d\u7b26<\/strong>\uff1a<\/p>\n\u5339\u914d\u8f83\u4e3a\u7c97\u653e\u3002\u4e3b\u8981\u4fa7\u91cd\u4e8e\u5bf9\u6587\u4ef6\u540d\u3001\u7b80\u5355\u6587\u672c\u7247\u6bb5\u7b49\u8fdb\u884c\u57fa\u4e8e\u5b57\u7b26\u6570\u91cf\u548c\u7c7b\u578b\u7684\u5927\u81f4\u5339\u914d\u3002<\/p>\n
\u6bd4\u5982\u5728\u6587\u4ef6\u7cfb\u7edf\u641c\u7d22\u4e2d\uff0c\u901a\u914d\u7b26\u53ef\u5feb\u901f\u627e\u5230\u7b26\u5408\u6269\u5c55\u540d\u6216\u6587\u4ef6\u540d\u90e8\u5206\u5927\u81f4\u7279\u5f81\u7684\u6587\u4ef6\uff0c\u4f46\u96be\u4ee5\u50cf\u6b63\u5219\u8868\u8fbe\u5f0f\u90a3\u6837\u5bf9\u6587\u4ef6\u5185\u5bb9\u4e2d\u590d\u6742\u6587\u672c\u6a21\u5f0f\u8fdb\u884c\u7cbe\u7ec6\u5339\u914d\u3002<\/p>\n
\u4f8b\u5982\uff0c\u201c*.jpg\u201d \u53ef\u627e\u5230\u6240\u6709\u4ee5 \u201c.jpg\u201d \u4e3a\u6269\u5c55\u540d\u7684\u6587\u4ef6\uff0c\u4f46\u65e0\u6cd5\u786e\u5b9a\u6587\u4ef6\u5185\u5bb9\u4e2d\u662f\u5426\u5b58\u5728\u7279\u5b9a\u683c\u5f0f\u7684\u6587\u672c\u3002<\/p>\n
3.perl\u6b63\u5219<\/h1>\n
Perl\u8bed\u8a00\u4ee5\u5176\u5f3a\u5927\u7684\u6587\u672c\u5904\u7406\u80fd\u529b\u800c\u95fb\u540d\uff0c\u5176\u4e2d\u6b63\u5219\u8868\u8fbe\u5f0f\u662f\u5176\u6838\u5fc3\u7279\u6027\u4e4b\u4e00\u3002Perl\u7684\u6b63\u5219\u8868\u8fbe\u5f0f\u529f\u80fd\u975e\u5e38\u5f3a\u5927\uff0c\u57fa\u672c\u4e0a\u662f\u5e38\u7528\u8bed\u8a00\u4e2d\u6700\u5f3a\u5927\u7684\uff0c\u5f88\u591a\u8bed\u8a00\u8bbe\u8ba1\u6b63\u5219\u5f0f\u652f\u6301\u7684\u65f6\u5019\u90fd\u53c2\u8003Perl\u7684\u6b63\u5219\u8868\u8fbe\u5f0f\u3002Perl\u7684\u6b63\u5219\u8868\u8fbe\u5f0f\u6709\u4e09\u79cd\u5f62\u5f0f\uff0c\u5206\u522b\u662f\u5339\u914d\u3001\u66ff\u6362\u548c\u8f6c\u5316<\/p>\n
\u57fa\u672c\u8bed\u6cd5<\/h2>\n
\u5728 Perl \u4e2d\uff0c\u6b63\u5219\u8868\u8fbe\u5f0f\u901a\u5e38\u7528 m\/\/ \u8fdb\u884c\u5339\u914d\uff0c\u7528 s\/\/\/ \u8fdb\u884c\u66ff\u6362\u3002\u5982\u679c\u4e0d\u6307\u5b9a m\uff0c\u4e5f\u53ef\u4ee5\u76f4\u63a5\u4f7f\u7528 \/\/ \u8fdb\u884c\u5339\u914d<\/p>\n
\u5e38\u7528\u5b57\u7b26<\/h2>\n
\u70b9\u00a0.\uff1a\u5339\u914d\u4efb\u4f55\u5355\u4e2a\u5b57\u7b26\uff08\u9664\u4e86\u6362\u884c\u7b26\uff09\u3002
\n\u661f\u53f7\u00a0*\uff1a\u5339\u914d\u524d\u4e00\u4e2a\u5b57\u7b26\u96f6\u6b21\u6216\u591a\u6b21\u3002
\n\u52a0\u53f7\u00a0+\uff1a\u5339\u914d\u524d\u4e00\u4e2a\u5b57\u7b26\u4e00\u6b21\u6216\u591a\u6b21\u3002
\n\u95ee\u53f7\u00a0?\uff1a\u5339\u914d\u524d\u4e00\u4e2a\u5b57\u7b26\u96f6\u6b21\u6216\u4e00\u6b21\u3002
\n\u82b1\u62ec\u53f7\u00a0{}\uff1a\u6307\u5b9a\u524d\u4e00\u4e2a\u5b57\u7b26\u7684\u51fa\u73b0\u6b21\u6570\u3002
\n\u65b9\u62ec\u53f7\u00a0[]\uff1a\u5b9a\u4e49\u4e00\u4e2a\u5b57\u7b26\u7c7b\u3002
\n\u8131\u5b57\u7b26\u00a0^\uff1a\u5339\u914d\u884c\u9996\u6216\u5426\u5b9a\u5b57\u7b26\u7c7b\u3002
\n\u7f8e\u5143\u7b26\u53f7\u00a0$\uff1a\u5339\u914d\u884c\u5c3e\u3002
\n\u7ad6\u7ebf\u00a0|\uff1a\u903b\u8f91\u6216\u3002
\n\u5706\u62ec\u53f7\u00a0()\uff1a\u5206\u7ec4\u548c\u6355\u83b7<\/p>\n
i \u5ffd\u7565\u6a21\u5f0f\u4e2d\u7684\u5927\u5c0f\u5199
\nm \u591a\u884c\u6a21\u5f0f
\no \u4ec5\u8d4b\u503c\u4e00\u6b21
\ns \u5355\u884c\u6a21\u5f0f\uff0c”.” \u5339\u914d “\\n”\uff08\u9ed8\u8ba4\u4e0d\u5339\u914d\uff09
\nx \u5ffd\u7565\u6a21\u5f0f\u4e2d\u7684\u7a7a\u767d
\ng \u5168\u5c40\u5339\u914d
\ncg \u5168\u5c40\u5339\u914d\u5931\u8d25\u540e\uff0c\u5141\u8bb8\u518d\u6b21\u67e5\u627e\u5339\u914d\u4e32<\/p>\n
\u6b63\u5219\u8868\u8fbe\u5f0f\u53d8\u91cf<\/h4>\n
Perl\u5904\u7406\u5b8c\u540e\u4f1a\u7ed9\u5339\u914d\u5230\u7684\u503c\u5b58\u5728\u4e09\u4e2a\u7279\u6b8a\u53d8\u91cf\u540d\uff1a<\/p>\n
$\uff1a\u5339\u914d\u90e8\u5206\u7684\u524d\u4e00\u90e8\u5206\u5b57\u7b26\u4e32
\n$&\uff1a\u5339\u914d\u7684\u5b57\u7b26\u4e32
\n$’\uff1a\u8fd8\u6ca1\u6709\u5339\u914d\u7684\u5269\u4f59\u5b57\u7b26\u4e32<\/p>\n
Perl\u4e2d\u7684\u4fee\u9970\u7b26\u5206\u4e3a\u4e24\u5927\u7c7b\uff1a\u6a21\u5f0f\u4fee\u9970\u7b26\u548c\u5339\u914d\u4fee\u9970\u7b26\u3002<\/h2>\n\u6a21\u5f0f\u4fee\u9970\u7b26<\/h3>\n
\/i\uff1a\u4e0d\u533a\u5206\u5927\u5c0f\u5199\u8fdb\u884c\u5339\u914d\u3002
\n\/m\uff1a\u591a\u884c\u5339\u914d\uff0c\u4f7f\u5f97\u00a0^\u00a0\u548c\u00a0$\u00a0\u5339\u914d\u6bcf\u4e00\u884c\u7684\u5f00\u59cb\u548c\u7ed3\u675f\u3002
\n\/s\uff1a\u5355\u884c\u5339\u914d\uff0c\u4f7f\u5f97\u70b9\u53f7\u00a0.\u00a0\u5339\u914d\u6240\u6709\u5b57\u7b26\uff0c\u5305\u62ec\u6362\u884c\u7b26\u3002
\n\/x\uff1a\u6269\u5c55\u6a21\u5f0f\uff0c\u5141\u8bb8\u5728\u6b63\u5219\u8868\u8fbe\u5f0f\u4e2d\u52a0\u5165\u7a7a\u683c\u548c\u6ce8\u91ca\uff0c\u63d0\u9ad8\u53ef\u8bfb\u6027\u3002<\/p>\n
\u5339\u914d\u4fee\u9970\u7b26<\/h3>\n
\/g\uff1a\u5168\u5c40\u5339\u914d\uff0c\u627e\u5230\u6240\u6709\u5339\u914d\u9879\uff0c\u800c\u4e0d\u662f\u4ec5\u7b2c\u4e00\u4e2a\u3002
\n\/c\uff1a\u5339\u914d\u65f6\u4e0d\u6355\u83b7\u5206\u7ec4\uff0c\u63d0\u9ad8\u6548\u7387\u3002
\n\/l\uff1a\u4ece\u5339\u914d\u7ed3\u679c\u4e2d\u5220\u9664\u53cd\u5411\u5f15\u7528\u3002
\n\/p\uff1a\u6267\u884c\u6b63\u5219\u8868\u8fbe\u5f0f\u65f6\uff0c\u4fdd\u7559\u6700\u540e\u7684\u5339\u914d\u7ed3\u679c\u3002<\/p>\n
\u96f6\u5bbd\u65ad\u8a00<\/h3>\n
(?=…)\uff1a\u6b63\u5411\u80af\u5b9a\u9884\u67e5\uff0c\u5728\u4efb\u4f55\u5339\u914d\u00a0…\u00a0\u7684\u5b57\u7b26\u4e32\u5f00\u59cb\u5904\u5339\u914d\u3002
\n(?!…)\uff1a\u6b63\u5411\u5426\u5b9a\u9884\u67e5\uff0c\u5728\u4efb\u4f55\u4e0d\u5339\u914d\u00a0…\u00a0\u7684\u5b57\u7b26\u4e32\u5f00\u59cb\u5904\u5339\u914d\u3002
\n(?<=…)\uff1a\u53cd\u5411\u80af\u5b9a\u9884\u67e5\uff0c\u5728\u4efb\u4f55\u5339\u914d\u00a0…\u00a0\u7684\u5b57\u7b26\u4e32\u7ed3\u675f\u5904\u5339\u914d\u3002
\n(?<!…)\uff1a\u53cd\u5411\u5426\u5b9a\u9884\u67e5\uff0c\u5728\u4efb\u4f55\u4e0d\u5339\u914d\u00a0…\u00a0\u7684\u5b57\u7b26\u4e32\u7ed3\u675f\u5904\u5339\u914d\u3002<\/p>\n
\u793a\u4f8b<\/h2>\n1<\/h4>\n
[root@shell \/server\/scripts]$ cat perl.sh
\n#!\/usr\/bin\/perl
\n$bar = “I am runoob site. welcome to runoob site.”;
\nif ($bar =~ \/run\/) {
\nprint “\u7b2c\u4e00\u6b21\u5339\u914d\\n”;
\n} else {
\nprint “\u7b2c\u4e00\u6b21\u4e0d\u5339\u914d\\n”;
\n}
\n$bar = “run”;
\nif ($bar =~ \/run\/) {
\nprint “\u7b2c\u4e8c\u6b21\u5339\u914d\\n”;
\n} else {
\nprint “\u7b2c\u4e8c\u6b21\u4e0d\u5339\u914d\\n”;
\n}
\n[root@shell \/server\/scripts]$ perl perl.sh
\n\u7b2c\u4e00\u6b21\u5339\u914d
\n\u7b2c\u4e8c\u6b21\u5339\u914d<\/p>\n
2<\/h4>\n
[root@shell \/server\/scripts]$ cat perl1.sh
\n#!\/usr\/bin\/perl
\nuse strict;
\nuse warnings;<\/p>\n
my $text = “The quick brown fox jumps over the lazy dog.”;<\/p>\n
# \u6b63\u5411\u80af\u5b9a\u9884\u67e5
\nif ($text =~ \/fox(?= jumps)\/) {
\nprint “Found ‘fox’ followed by ‘jumps’.\\n”;
\n}<\/p>\n
# \u6b63\u5411\u5426\u5b9a\u9884\u67e5
\nif ($text =~ \/fox(?! jumps)\/) {
\nprint “Found ‘fox’ not followed by ‘jumps’.\\n”;
\n}<\/p>\n
# \u53cd\u5411\u80af\u5b9a\u9884\u67e5
\nif ($text =~ \/(?<=The )quick\/) {
\nprint “Found ‘quick’ preceded by ‘The ‘.\\n”;
\n}<\/p>\n
# \u53cd\u5411\u5426\u5b9a\u9884\u67e5
\nif ($text =~ \/(?<!The )quick\/) {
\nprint “Found ‘quick’ not preceded by ‘The ‘.\\n”;
\n}
\n[root@shell \/server\/scripts]$ perl perl1.sh
\nFound ‘fox’ followed by ‘jumps’.
\nFound ‘quick’ preceded by ‘The ‘.<\/p>\n
3.\u975e\u6355\u83b7\u7ec4\uff1a\u7528\u4e8e\u5e94\u7528\u91cf\u8bcd\uff0c\u4f46\u4e0d\u5b58\u50a8\u5339\u914d\u7684\u6587\u672c<\/h4>\n
[root@shell \/server\/scripts]$ cat perl2.sh
\n$text = “The year 2023 is not far away.”;
\n@matches = ($text =~ \/(?:\\d+)\/g);
\nprint “Year found: @matches\\n”;
\n[root@shell \/server\/scripts]$ perl perl2.sh
\nYear found: 2023<\/p>\n
4.\u540e\u5411\u548c\u524d\u5411\u65ad\u8a00\uff1a\u65ad\u8a00\u5141\u8bb8\u60a8\u6307\u5b9a\u5fc5\u987b\u5728\u5b57\u7b26\u4e32\u7684\u67d0\u4e2a\u4f4d\u7f6e\u4e4b\u524d\u6216\u4e4b\u540e\u7684\u6761\u4ef6\uff0c\u4f46\u4e0d\u4f1a\u6d88\u8017\u5b57\u7b26<\/h4>\n
[root@shell \/server\/scripts]$ cat perl3.sh
\n$text = “We have 2 apples and 3 bananas.”;
\nif ($text =~ \/(\\d+) apples\/) {
\nprint “We have “. $1. ” apples.\\n”;
\n}
\n[root@shell \/server\/scripts]$ perl perl3.sh
\nWe have 2 apples.<\/p>\n
5.\u6b63\u5411\u540e\u77bb\uff1a\u5141\u8bb8\u60a8\u6307\u5b9a\u67d0\u4e2a\u6a21\u5f0f\u540e\u9762\u5fc5\u987b\u8ddf\u968f\u7684\u53e6\u4e00\u4e2a\u6a21\u5f0f<\/h4>\n
[root@shell \/server\/scripts]$ cat perl4.sh
\n$text = “Please press F5 to refresh.”;
\nif ($text =~ \/(F5)(?= to refresh)\/) {
\nprint “Press “. $1. ” to refresh.\\n”;
\n}
\n[root@shell \/server\/scripts]$ perl perl4.sh
\nPress F5 to refresh.<\/p>\n
6.\u8d1f\u5411\u5148\u884c\u65ad\u8a00\uff1a\u7528\u4e8e\u6307\u5b9a\u67d0\u4e2a\u6a21\u5f0f\u524d\u9762\u4e0d\u80fd\u51fa\u73b0\u7684\u6a21\u5f0f<\/h4>\n
[root@shell \/server\/scripts]$ cat perl5.sh
\n$text = “Do not press F12.”;
\nif ($text =~ \/(F12)(?! to refresh)\/) {
\nprint “Do not press “. $1. “.\\n”;
\n}
\n[root@shell \/server\/scripts]$ perl perl5.sh
\nDo not press F12.<\/p>\n
7.\u4f7f\u7528lookbehind\u8fdb\u884c\u65ad\u8a00\uff1a\u5141\u8bb8\u4f60\u5728\u5b57\u7b26\u4e32\u4e2d\u5411\u524d\u67e5\u770b\uff0c\u786e\u4fdd\u67d0\u4e2a\u6a21\u5f0f\u4e4b\u524d\u4e0d\u51fa\u73b0<\/h4>\n
[root@shell \/server\/scripts]$ cat perl6.sh
\n$text = “The date is 12\/31\/2023.”;
\nif ($text =~ \/(?<!\\w)(\\d{1,2}\\\/\\d{1,2}\\\/\\d{4})\/) {
\nprint “Date found: $1\\n”;
\n}
\n[root@shell \/server\/scripts]$ perl perl6.sh
\nDate found: 12\/31\/2023<\/p>\n
8.\u5047\u8bbe\u6211\u4eec\u60f3\u627e\u5230\u6240\u6709\u4e0d\u5728\u5355\u8bcd\u5185\u90e8\u7684 “q”<\/h4>\n
[root@shell \/server\/scripts]$ cat perl7.sh
\n#!\/usr\/bin\/perl
\nuse strict;
\nuse warnings;<\/p>\n
my $text = “The quick brown fox jumps over the lazy dog.”;<\/p>\n
# \u4f7f\u7528\u8d1f\u5411\u540e\u77bb\u65ad\u8a00\u627e\u5230\u4e0d\u5728\u5355\u8bcd\u5185\u90e8\u7684 “q”
\nwhile ($text =~ \/(?<!\\w)q\/g) {
\nprint “Found ‘q’ not preceded by a word character at position: “, pos($text), “\\n”;
\n}
\n[root@shell \/server\/scripts]$ perl perl7.sh
\nFound ‘q’ not preceded by a word character at position: 5<\/p>\n
<\/p>\n","protected":false},"excerpt":{"rendered":"
1.\u6b63\u5219\u8868\u8fbe\u5f0f\u6982\u8ff0 \u6b63\u5219\u8868\u8fbe\u5f0f\uff08Regular Expression\uff09\u662f\u4e00\u79cd\u7528\u4e8e\u5339\u914d\u3001\u67e5\u627e\u548c\u66ff\u6362\u6587\u672c\u4e2d\u7279\u5b9a\u6a21\u5f0f […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"spay_email":""},"categories":[5],"tags":[],"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/www.qiangzhenshuai.com\/index.php?rest_route=\/wp\/v2\/posts\/1368"}],"collection":[{"href":"https:\/\/www.qiangzhenshuai.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.qiangzhenshuai.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.qiangzhenshuai.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.qiangzhenshuai.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1368"}],"version-history":[{"count":4,"href":"https:\/\/www.qiangzhenshuai.com\/index.php?rest_route=\/wp\/v2\/posts\/1368\/revisions"}],"predecessor-version":[{"id":1375,"href":"https:\/\/www.qiangzhenshuai.com\/index.php?rest_route=\/wp\/v2\/posts\/1368\/revisions\/1375"}],"wp:attachment":[{"href":"https:\/\/www.qiangzhenshuai.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1368"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.qiangzhenshuai.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1368"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.qiangzhenshuai.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1368"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
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<\/a><\/p>\n