\u6b63\u5219\u8868\u8fbe\u5f0f\u5176\u5b9e\u5c31\u662f\u5728\u6267\u884c\u641c\u7d22\u65f6\u7684\u683c\u5f0f\uff0c\u5b83\u7531\u4e00\u4e9b\u5b57\u6bcd\u548c\u6570\u5b57\u7ec4\u5408\u800c\u6210\u3002 \u6b63\u5219\u8868\u8fbe\u5f0f\u4e3b\u8981\u4f9d\u8d56\u4e8e\u5143\u5b57\u7b26\u3002\u5143\u5b57\u7b26\u4e0d\u4ee3\u8868\u4ed6\u4eec\u672c\u8eab\u7684\u5b57\u9762\u610f\u601d\uff0c\u4ed6\u4eec\u90fd\u6709\u7279\u6b8a\u7684\u542b\u4e49\u3002\u4e00\u4e9b\u5143\u5b57\u7b26\u5199\u5728\u65b9\u62ec\u53f7\u5fe0\u7684\u65f6\u5019\u6709\u4e00\u4e9b\u7279\u6b8a\u7684\u610f\u601d\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5143\u5b57\u7b26\u7684\u4ecb\u7ecd\uff1a<\/p>\n ".ar" => The car<\/strong> par<\/strong>ked in the gar<\/strong>age.<\/p>\n \u65b9\u62ec\u53f7\u7528\u6765\u6307\u5b9a\u4e00\u4e2a\u5b57\u7b26\u96c6\u3002\u5728\u65b9\u62ec\u53f7\u4e2d\u4f7f\u7528\u8fde\u5b57\u7b26 "[Tt]he" => The<\/strong> car parket in the<\/strong> garage.<\/p>\n \u65b9\u62ec\u53f7\u7684\u53e5\u53f7\u5c31\u8868\u793a\u53e5\u53f7\u3002 "ar[.] => A garage is a good place to park a car.<\/strong>"<\/p>\n \u4e00\u822c\u6765\u8bf4 "[^c]ar" => The car par<\/strong>ked in the gar<\/strong>age.<\/p>\n \u540e\u9762\u8ddf\u7740\u5143\u5b57\u7b26 "[a-z]*" => The<\/strong> car<\/strong> parked<\/strong> in<\/strong> the<\/strong> garage<\/strong> #21.<\/p>\n "\\s*cat\\s*" => The fat cat<\/strong> sat on the concat<\/strong>enation.<\/p>\n "c.+t" => The fat cat sat on the mat<\/strong>.<\/p>\n \u5728\u6b63\u5219\u8868\u8fbe\u5f0f\u4e2d\u5143\u5b57\u7b26 "[T]?he" => The<\/strong> car is parked in the<\/strong> garage.<\/p>\n \u5728\u6b63\u5219\u8868\u8fbe\u5f0f\u4e2d "[0-9]{2,3}" => The number was 9.999<\/strong>7 but we rounded it off to 10<\/strong>.0.<\/p>\n \u6211\u4eec\u53ef\u4ee5\u7701\u7565\u7b2c\u4e8c\u4e2a\u53c2\u6570\u3002 "[0-9]{2,}" => The number was 9.9997<\/strong> but we rounded it off to 10<\/strong>.0.<\/p>\n \u5982\u679c\u9017\u53f7\u4e5f\u7701\u7565\u6389\u5219\u8868\u793a\u91cd\u590d\u56fa\u5b9a\u7684\u6b21\u6570\u3002 "[0-9]{3}" => The number was 9.999<\/strong>7 but we rounded it off to 10.0.<\/p>\n \u7279\u5f81\u6807\u7fa4\u662f\u4e00\u7ec4\u5199\u5728 \u6211\u4eec\u8fd8\u53ef\u4ee5\u5728 "(c|g|p)ar" => The car<\/strong> is par<\/strong>ked in the gar<\/strong>age.<\/p>\n \u6216\u8fd0\u7b97\u7b26\u5c31\u662f\u8868\u793a\u6216\uff0c\u7528\u4f5c\u5224\u65ad\u6761\u4ef6\u3002 "(T|t)he|car" => The<\/strong> car<\/strong> is parked in the<\/strong> garage.<\/p>\n \u53cd\u659c\u7ebf \u4f8b\u5982\uff0c "(f|c|m)at.?" => The fat<\/strong> cat<\/strong> sat on the mat.<\/strong><\/p>\n \u5728\u6b63\u5219\u8868\u8fbe\u5f0f\u4e2d\uff0c\u60f3\u8981\u5339\u914d\u6307\u5b9a\u5f00\u5934\u6216\u8005\u7ed3\u5c3e\u7684\u5b57\u7b26\u4e32\u5c31\u8981\u4f7f\u7528\u5230\u951a\u70b9\u3002 \u4f8b\u5982\uff0c "(T|t)he" => The<\/strong> car is parked in the<\/strong> garage.<\/p>\n "^(T|t)he" => The<\/strong> car is parked in the garage.<\/p>\n \u540c\u7406\u4e8e "(at.)" => The fat cat.<\/strong> sat.<\/strong> on the mat.<\/strong><\/p>\n "(at.)$" => The fat cat. sat. on the mat.<\/strong><\/p>\n \u6b63\u5219\u8868\u8fbe\u5f0f\u63d0\u4f9b\u4e00\u4e9b\u5e38\u7528\u7684\u5b57\u7b26\u96c6\u7b80\u5199\u3002\u5982\u4e0b\uff1a<\/p>\n \u57fa\u672c\u5339\u914d \u6b63\u5219\u8868\u8fbe\u5f0f\u5176\u5b9e\u5c31\u662f\u5728\u6267\u884c\u641c\u7d22\u65f6\u7684\u683c\u5f0f\uff0c\u5b83\u7531\u4e00\u4e9b\u5b57\u6bcd\u548c\u6570\u5b57\u7ec4\u5408\u800c\u6210\u3002 \u4f8b\u5982\uff1a\u4e00\u4e2a\u6b63\u5219\u8868\u8fbe\u5f0fthe\uff0c\u5b83\u8868… » \u9605\u8bfb\u5168\u6587<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[23],"tags":[],"class_list":["post-1855","post","type-post","status-publish","format-standard","hentry","category-regex"],"_links":{"self":[{"href":"http:\/\/blue.yn.cn\/index.php?rest_route=\/wp\/v2\/posts\/1855","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/blue.yn.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/blue.yn.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/blue.yn.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/blue.yn.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1855"}],"version-history":[{"count":9,"href":"http:\/\/blue.yn.cn\/index.php?rest_route=\/wp\/v2\/posts\/1855\/revisions"}],"predecessor-version":[{"id":1858,"href":"http:\/\/blue.yn.cn\/index.php?rest_route=\/wp\/v2\/posts\/1855\/revisions\/1858"}],"wp:attachment":[{"href":"http:\/\/blue.yn.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1855"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/blue.yn.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1855"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/blue.yn.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1855"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
\n\u4f8b\u5982\uff1a\u4e00\u4e2a\u6b63\u5219\u8868\u8fbe\u5f0fthe<\/code>\uff0c\u5b83\u8868\u793a\u4e00\u4e2a\u89c4\u5219\uff1a\u7531\u5b57\u6bcdt<\/code>\u5f00\u59cb\uff0c\u63a5\u7740\u662fh<\/code>\uff0c\u518d\u63a5\u7740\u662fe<\/code>\u3002
\n\u6b63\u5219\u8868\u8fbe\u5f0f\u662f\u5927\u5c0f\u5199\u654f\u611f\u7684\uff0c\u6240\u4ee5The<\/code>\u4e0d\u4f1a\u5339\u914dthe<\/code>\u3002<\/p>\n\u5143\u5b57\u7b26<\/h3>\n
\n\n
\n \n\u5143\u5b57\u7b26<\/th>\n \u63cf\u8ff0<\/th>\n<\/tr>\n<\/thead>\n \n .<\/td>\n \u53e5\u53f7\u5339\u914d\u4efb\u610f\u5355\u4e2a\u5b57\u7b26\u9664\u4e86\u6362\u884c\u7b26<\/td>\n<\/tr>\n \n []<\/td>\n \u5b57\u7b26\u96c6\u3002\u5339\u914d\u65b9\u62ec\u53f7\u5185\u7684\u4efb\u610f\u5b57\u7b26<\/td>\n<\/tr>\n \n [^]<\/td>\n \u5426\u5b9a\u7684\u5b57\u7b26\u96c6\u3002\u5339\u914d\u9664\u4e86\u65b9\u62ec\u53f7\u91cc\u7684\u4efb\u610f\u5b57\u7b26<\/td>\n<\/tr>\n \n *<\/td>\n \u5339\u914d>=0\u4e2a\u91cd\u590d\u7684\u5728*\u53f7\u4e4b\u524d\u7684\u5b57\u7b26<\/td>\n<\/tr>\n \n +<\/td>\n \u5339\u914d>=1\u4e2a\u91cd\u590d\u7684\u5728+\u53f7\u4e4b\u524d\u7684\u5b57\u7b26<\/td>\n<\/tr>\n \n ?<\/td>\n ?\u53f7\u4e4b\u524d\u7684\u5b57\u7b26\u4e3a\u53ef\u9009<\/td>\n<\/tr>\n \n {n,m}<\/td>\n \u5339\u914dnum\u4e2a\u5927\u62ec\u53f7\u4e4b\u524d\u7684\u5b57\u7b26\u6216\u5b57\u7b26\u96c6\uff08n<=num<=m\uff09<\/td>\n<\/tr>\n \n (xyz)<\/td>\n \u5206\u7ec4\uff0c\u5339\u914d\u4e0exyz\u5b8c\u5168\u76f8\u7b49\u7684\u5b57\u7b26\u4e32<\/td>\n<\/tr>\n \n |<\/td>\n \u6216\u8fd0\u7b97\u7b26\uff0c\u5339\u914d\u7b26\u53f7\u524d\u6216\u540e\u7684\u5b57\u7b26<\/td>\n<\/tr>\n \n \\<\/td>\n \u8f6c\u4e49\u5b57\u7b26\uff0c\u7528\u4e8e\u5339\u914d\u4e00\u4e9b\u4fdd\u7559\u7684\u5b57\u7b26[] () {} . * + ? ^ $ \\ |<\/td>\n<\/tr>\n \n ^<\/td>\n \u4ece\u884c\u5f00\u59cb\u5339\u914d<\/td>\n<\/tr>\n \n $<\/td>\n \u4ece\u672b\u7aef\u5f00\u59cb\u5339\u914d<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n \u70b9\u8fd0\u7b97\u7b26.<\/h4>\n
.<\/code>\u662f\u5143\u5b57\u7b26\u4e2d\u6700\u7b80\u5355\u7684\u4f8b\u5b50\u3002.<\/code>\u5339\u914d\u4efb\u610f\u5355\u4e2a\u5b57\u7b26\uff0c\u4f46\u4e0d\u5339\u914d\u6362\u884c\u7b26\u3002\u4f8b\u5982\uff0c\u8868\u8fbe\u5f0f.ar<\/code>\u5339\u914d\u4e00\u4e2a\u4efb\u610f\u5b57\u7b26\u540e\u9762\u8ddf\u7740\u662fa<\/code>\u548cr<\/code>\u7684\u5b57\u7b26\u4e32\u3002<\/p>\n\u5b57\u7b26\u96c6<\/h4>\n
-<\/code>\u6765\u6307\u5b9a\u5b57\u7b26\u96c6\u7684\u8303\u56f4\u3002
\n\u5728\u65b9\u62ec\u53f7\u4e2d\u7684\u5b57\u7b26\u96c6\u4e0d\u5173\u5fc3\u987a\u5e8f\u3002
\n\u4f8b\u5982\uff0c\u8868\u8fbe\u5f0f[Tt]he<\/code>\u5339\u914dthe<\/code>\u548cThe<\/code>\u3002<\/p>\n
\n\u8868\u8fbe\u5f0far[.]<\/code>\u5339\u914dar.<\/code>\u5b57\u7b26\u4e32<\/p>\n\u5426\u5b9a\u5b57\u7b26\u96c6<\/h4>\n
^<\/code>\u8868\u793a\u4e00\u4e2a\u5b57\u7b26\u4e32\u7684\u5f00\u5934\uff0c\u4f46\u5b83\u7528\u5728\u4e00\u4e2a\u65b9\u62ec\u53f7\u7684\u5f00\u5934\u7684\u65f6\u5019\uff0c\u5b83\u8868\u793a\u8fd9\u4e2a\u5b57\u7b26\u96c6\u662f\u5426\u5b9a\u7684\u3002
\n\u4f8b\u5982\uff0c\u8868\u8fbe\u5f0f[^c]ar<\/code>\u5339\u914d\u4e00\u4e2a\u540e\u9762\u8ddf\u7740ar<\/code>\u7684\u9664\u4e86c<\/code>\u7684\u4efb\u610f\u5b57\u7b26\u3002<\/p>\n\u91cd\u590d\u6b21\u6570<\/h4>\n
+<\/code>\uff0c*<\/code>\uff0c?<\/code>\u7684\uff0c\u7528\u6765\u6307\u5b9a\u5339\u914d\u5b50\u6a21\u5f0f\u7684\u6b21\u6570\u3002
\n\u8fd9\u4e9b\u5143\u5b57\u7b26\u5728\u4e0d\u540c\u7684\u60c5\u51b5\u4e0b\u6709\u7740\u4e0d\u540c\u7684\u610f\u601d\u3002<\/p>\n*\u53f7<\/h4>\n
*<\/code>\u53f7\u5339\u914d\u5728*<\/code>\u4e4b\u524d\u7684\u5b57\u7b26\u51fa\u73b0\u5927\u4e8e\u7b49\u4e8e0\u6b21\u3002
\n\u4f8b\u5982\uff0c\u8868\u8fbe\u5f0fa*<\/code>\u5339\u914d0\u6216\u66f4\u591a\u4e2aa<\/code>\u5f00\u5934\u7684\u5b57\u7b26\u3002
\n\u8868\u8fbe\u5f0f[a-z]*<\/code>\u5339\u914d\u4e00\u4e2a\u884c\u4e2d\u6240\u6709\u4ee5\u5c0f\u5199\u5b57\u6bcd\u5f00\u5934\u7684\u5b57\u7b26\u4e32\u3002<\/p>\n*<\/code>\u5b57\u7b26\u548c.<\/code>\u5b57\u7b26\u642d\u914d\u53ef\u4ee5\u5339\u914d\u6240\u6709\u7684\u5b57\u7b26.*<\/code>\u3002
\n*<\/code>\u548c\u8868\u793a\u5339\u914d\u7a7a\u683c\u7684\u5b57\u7b26\\s<\/code>\u8fde\u8d77\u6765\u7528\uff0c\u5982\u8868\u8fbe\u5f0f\\s*cat\\s*<\/code>\u5339\u914d0\u6216\u66f4\u591a\u4e2a\u7a7a\u683c\u5f00\u5934\u548c0\u6216\u66f4\u591a\u4e2a\u7a7a\u683c\u7ed3\u5c3e\u7684cat<\/code>\u5b57\u7b26\u4e32\u3002<\/p>\n+\u53f7<\/h4>\n
+<\/code>\u53f7\u5339\u914d+<\/code>\u53f7\u4e4b\u524d\u7684\u5b57\u7b26\u51fa\u73b0 >= 1\u6b21\u3002
\n\u4f8b\u5982\u8868\u8fbe\u5f0fc.+t<\/code>\u5339\u914d\u4ee5\u9996\u5b57\u6bcdc<\/code>\u5f00\u5934\u4ee5t<\/code>\u7ed3\u5c3e\uff0c\u4e2d\u95f4\u8ddf\u7740\u81f3\u5c11\u4e00\u4e2a\u5b57\u7b26\u7684\u5b57\u7b26\u4e32\u3002<\/p>\n?\u53f7<\/h4>\n
?<\/code> \u6807\u8bb0\u5728\u7b26\u53f7\u524d\u9762\u7684\u5b57\u7b26\u4e3a\u53ef\u9009\uff0c\u5373\u51fa\u73b0 0 \u6216 1 \u6b21\u3002
\n\u4f8b\u5982\uff0c\u8868\u8fbe\u5f0f [T]?he<\/code> \u5339\u914d\u5b57\u7b26\u4e32 he<\/code> \u548c The<\/code>\u3002<\/p>\n{}\u53f7<\/h4>\n
{} <\/code>\u662f\u4e00\u4e2a\u91cf\u8bcd\uff0c\u5e38\u7528\u6765\u9650\u5b9a\u4e00\u4e2a\u6216\u4e00\u7ec4\u5b57\u7b26\u53ef\u4ee5\u91cd\u590d\u51fa\u73b0\u7684\u6b21\u6570\u3002
\n\u4f8b\u5982\uff0c \u8868\u8fbe\u5f0f [0-9]{2,3}<\/code> \u5339\u914d\u6700\u5c11 2 \u4f4d\u6700\u591a 3 \u4f4d 0~9 \u7684\u6570\u5b57\u3002<\/p>\n
\n\u4f8b\u5982\uff0c[0-9]{2,}<\/code>\u5339\u914d\u81f3\u5c11\u4e24\u4f4d0~9\u7684\u6570\u5b57\u3002<\/p>\n
\n\u4f8b\u5982\uff0c[0-9]{3}<\/code>\u5339\u914d3\u4f4d\u6570\u5b57\u3002<\/p>\n(...)\u7279\u5f81\u6807\u7fa4\/\u5206\u7ec4<\/h4>\n
(...)<\/code>\u4e2d\u7684\u5b50\u6a21\u5f0f\u3002
\n(...)<\/code>\u4e2d\u5305\u542b\u7684\u5185\u5bb9\u5c06\u4f1a\u88ab\u770b\u6210\u4e00\u4e2a\u6574\u4f53\u3002
\n\u4f8b\u5982\uff0c\u8868\u8fbe\u5f0f(ab)*<\/code>\u5339\u914d\u8fde\u7eed\u51fa\u73b00\u6216\u66f4\u591a\u4e2aab<\/code>\u3002
\n\u5982\u679c\u6ca1\u6709\u4f7f\u7528(...)<\/code>\uff0c\u90a3\u4e48\u8868\u8fbe\u5f0fab*<\/code>\u5c06\u5339\u914d\u8fde\u7eed\u51fa\u73b00\u6216\u591a\u4e2ab<\/code>\u3002
\n\u518d\u6bd4\u5982\u4e4b\u524d\u8bf4\u7684{}<\/code>\u662f\u7528\u6765\u8868\u793a\u524d\u9762\u4e00\u4e2a\u5b57\u7b26\u51fa\u73b0\u6307\u5b9a\u6b21\u6570\u3002
\n\u4f46\u5982\u679c\u5728{}<\/code>\u524d\u52a0\u4e0a\u7279\u5f81\u6807\u7fa4(...)<\/code>\u5219\u8868\u793a\u6574\u4e2a\u6807\u7fa4\u5185\u7684\u5b57\u7b26\u91cd\u590dN<\/code>\u6b21\u3002<\/p>\n()<\/code>\u4e2d\u7528\u6216\u5b57\u7b26|<\/code>\u8868\u793a\u6216\u3002
\n\u4f8b\u5982\uff0c(c|g|p)ar<\/code>\u5339\u914dcar<\/code>\u6216gar<\/code>\u6216par<\/code>\u3002<\/p>\n|\u6216\u8fd0\u7b97\u7b26<\/h4>\n
\n\u4f8b\u5982\uff0c(T|t)he|car<\/code>\u5339\u914d(T|t)he<\/code>\u6216car<\/code>\u3002<\/p>\n\u8f6c\u7801\u7279\u6b8a\u5b57\u7b26<\/h4>\n
\\ <\/code> \u5728\u8868\u8fbe\u5f0f\u4e2d\u7528\u4e8e\u8f6c\u7801\u7d27\u8ddf\u5176\u540e\u7684\u5b57\u7b26\u3002
\n\u7528\u4e8e\u6307\u5b9a { } [ ] \/ \\ + * . $ ^ | ? <\/code> \u8fd9\u4e9b\u7279\u6b8a\u5b57\u7b26\u3002
\n\u5982\u679c\u60f3\u8981\u5339\u914d\u8fd9\u4e9b\u7279\u6b8a\u5b57\u7b26\u5219\u8981\u5728\u5176\u524d\u9762\u52a0\u4e0a\u53cd\u659c\u7ebf \\ <\/code> \u3002<\/p>\n.<\/code> \u662f\u7528\u6765\u5339\u914d\u9664\u6362\u884c\u7b26\u5916\u7684\u6240\u6709\u5b57\u7b26\u7684\u3002
\n\u5982\u679c\u60f3\u8981\u5339\u914d\u53e5\u5b50\u4e2d\u7684 .<\/code> \u5219\u8981\u5199\u6210 \\. <\/code><\/p>\n\u951a\u70b9<\/h4>\n
\n^<\/code>\u6307\u5b9a\u5f00\u5934\uff0c$<\/code>\u6307\u5b9a\u7ed3\u5c3e\u3002<\/p>\n^\u53f7<\/h4>\n
^<\/code>\u7528\u6765\u68c0\u67e5\u5339\u914d\u7684\u5b57\u7b26\u4e32\u662f\u5426\u5728\u6240\u5339\u914d\u5b57\u7b26\u4e32\u7684\u5f00\u5934
\n\u4f8b\u5982\uff0c\u5728abc<\/code>\u4e2d\u4f7f\u7528\u8868\u8fbe\u5f0f^a<\/code>\u4f1a\u5f97\u5230\u7ed3\u679ca<\/code>\u3002
\n\u4f46\u5982\u679c\u4f7f\u7528^b<\/code>\u5c06\u5339\u914d\u4e0d\u5230\u4efb\u4f55\u7ed3\u679c\u3002
\n\u56e0\u4e3a\u5728\u5b57\u7b26\u4e32abc<\/code>\u4e2d\u5e76\u4e0d\u662f\u4ee5b<\/code>\u5f00\u5934\u3002<\/p>\n^(T|t)he<\/code>\u5339\u914d\u4ee5The<\/code>\u6216the<\/code>\u5f00\u5934\u7684\u5b57\u7b26\u4e32\u3002<\/p>\n$\u53f7<\/h4>\n
^<\/code>\u53f7\uff0c$<\/code>\u53f7\u7528\u6765\u5339\u914d\u5b57\u7b26\u662f\u5426\u662f\u6700\u540e\u4e00\u4e2a\u3002
\n\u4f8b\u5982\uff0c(at\\.)$<\/code>\u5339\u914d\u4ee5at.<\/code>\u7ed3\u5c3e\u7684\u5b57\u7b26\u4e32\u3002<\/p>\n\u7b80\u5199\u5b57\u7b26\u96c6<\/h3>\n
<\/h3>\n","protected":false},"excerpt":{"rendered":"