\u300a\u0005\u5b66\u4e60\u6b63\u5219\u8868\u8fbe\u5f0f\u0005\u300b\u7b14\u8bb0<\/p>\n
^\u4ece\u5f00\u59cb\u5339\u914d
\n$\u5339\u914d\u7ed3\u675f
\n\\d\u5339\u914d\u4e00\u4e2a\u4efb\u610f\u963f\u62c9\u4f2f\u6570\u5b57
\n\\D\u5339\u914d\u4e00\u4e2a\u975e\u6570\u5b57\u5b57\u7b26\uff0c\u7b49\u4ef7\u4e8e[^0-9]\uff0c\u53c8\u7b49\u4ef7\u4e8e[^\\d]
\n. \u5339\u914d\u4efb\u610f\u4e00\u4e2a\u5b57\u7b26\uff0c\u4e0d\u5305\u542b\u6362\u884c\u548c\u56de\u8f66
\n\\d{3}\u8868\u793a\u51fa\u73b0\u5355\u4e2a\u6570\u5b57\u76843\u6b21\uff0c\u82b1\u62ec\u53f7\u91cc\u662f\u51fa\u73b0\u7684\u6b21\u6570
\n\\d{3,5}\u8868\u793a\u51fa\u73b0\u5355\u4e2a\u6570\u5b57\u6700\u5c0f3\u6b21\uff0c\u6700\u59275\u6b21
\n? \u51fa\u73b0\u96f6\u6b21\u6216\u4e00\u6b21
\n+ \u5339\u914d\u4e00\u4e2a\u6216\u591a\u4e2a\uff0c\u5305\u542b\u6362\u884c\u548c\u56de\u8f66
\n* \u5339\u914d\u96f6\u4e2a\u6216\u591a\u4e2a
\n\\w \u5339\u914d\u5b57\u6bcd\uff0c\u6570\u5b57\uff0c\u4e0b\u5212\u7ebf\uff0c\u7b49\u4ef7\u4e8e[_a-zA-Z0-9]
\n\\W \u5339\u914d\u975e\\w\u5339\u914d\u7684\u5b57\u7b26\uff0c\u7b49\u4ef7\u4e8e[^_a-zA-Z0-9]\uff0c\u53c8\u7b49\u4ef7\u4e8e[^\\w]
\n\\s \u5339\u914d\u7a7a\u683c\uff0c\u7b49\u4ef7\u4e8e[ ]
\n\\S \u5339\u914d\u975e\u7a7a\u683c\uff0c\u7b49\u4ef7\u4e8e[^\\s]
\n\\t \u5339\u914d\u5236\u8868\u7b26,tab
\n\\n \u5339\u914d\u6362\u884c\u7b26
\n\\r \u5339\u914d\u56de\u8f66\u7b26
\n\\b\u5339\u914d\u5355\u8bcd\u8fb9\u754c\uff0c\u4e0d\u6d88\u8017\u4efb\u4f55\u5b57\u7b26
\n\u5339\u914d\u5c0f\u5199\u5b57\u6bcd<\/p>\n
\u6309\u952e\u6b21\u6570\u6700\u5c11\u5219\u80dc<\/p>\n
\u521b\u5efa\u6355\u83b7\u5206\u7ec4(capturing group)\uff0c\u7528\u6765\u5339\u914d\u5b57\u7b26\u4e32\u4e2d\u7684\u4e00\u90e8\u5206\uff0c\u4f7f\u7528\u5411\u540e\u5f15\u7528(back reference)\uff0c\u5bf9\u6355\u83b7\u7684\u5206\u7ec4\u8fdb\u884c\u5f15\u7528\u3002<\/p>\n
$1\u662fperl\u98ce\u683c\u7684\u540e\u5411\u5f15\u7528<\/p>\n
\u5e38\u7528\u6b63\u5219\u8868\u8fbe\u5f0f<\/p>\n
\u5339\u914d\u57df\u540d<\/p>\n
grep -oE '(([a-zA-Z](-?[a-zA-Z0-9])*)\\.)+[a-zA-Z]{2,}'\n<\/pre>\n","protected":false},"excerpt":{"rendered":"\u300a\u0005\u5b66\u4e60\u6b63\u5219\u8868\u8fbe\u5f0f\u0005\u300b\u7b14\u8bb0 ^\u4ece\u5f00\u59cb\u5339\u914d $\u5339\u914d\u7ed3\u675f \\d\u5339\u914d\u4e00\u4e2a\u4efb\u610f\u963f\u62c9\u4f2f\u6570\u5b57 \\D\u5339\u914d\u4e00\u4e2a\u975e\u6570\u5b57\u5b57\u7b26\uff0c\u7b49\u4ef7\u4e8e[^0-9]\uff0c\u53c8\u7b49\u4ef7\u4e8e[^\\d] . \u5339\u914d\u4efb\u610f\u4e00\u4e2a\u5b57\u7b26\uff0c\u4e0d\u5305\u542b\u6362\u884c\u548c\u56de\u8f66 \\d{3}\u8868\u793a\u51fa\u73b0\u5355\u4e2a\u6570\u5b57\u76843\u6b21\uff0c\u82b1\u62ec\u53f7\u91cc\u662f\u51fa\u73b0\u7684\u6b21\u6570 \\d{3,5}\u8868\u793a\u51fa\u73b0\u5355\u4e2a\u6570\u5b57\u6700\u5c0f3\u6b21\uff0c\u6700\u59275\u6b21 ? \u51fa\u73b0\u96f6\u6b21\u6216\u4e00\u6b21 + \u5339\u914d\u4e00\u4e2a\u6216\u591a\u4e2a\uff0c\u5305\u542b\u6362\u884c\u548c\u56de\u8f66 * \u5339\u914d\u96f6\u4e2a\u6216\u591a\u4e2a \\w \u5339\u914d\u5b57\u6bcd\uff0c\u6570\u5b57\uff0c\u4e0b\u5212\u7ebf\uff0c\u7b49\u4ef7\u4e8e[_a-zA-Z0-9] \\W \u5339\u914d\u975e\\w\u5339\u914d\u7684\u5b57\u7b26\uff0c\u7b49\u4ef7\u4e8e[^_a-zA-Z0-9]\uff0c\u53c8\u7b49\u4ef7\u4e8e[^\\w] \\s \u5339\u914d\u7a7a\u683c\uff0c\u7b49\u4ef7\u4e8e[ ] \\S \u5339\u914d\u975e\u7a7a\u683c\uff0c\u7b49\u4ef7\u4e8e[^\\s] \\t \u5339\u914d\u5236\u8868\u7b26,tab \\n \u5339\u914d\u6362\u884c\u7b26 \\r \u5339\u914d\u56de\u8f66\u7b26 \\b\u5339\u914d\u5355\u8bcd\u8fb9\u754c\uff0c\u4e0d\u6d88\u8017\u4efb\u4f55\u5b57\u7b26 \u5339\u914d\u5c0f\u5199\u5b57\u6bcd \u6309\u952e\u6b21\u6570\u6700\u5c11\u5219\u80dc \u521b\u5efa\u6355\u83b7\u5206\u7ec4(capturing group)\uff0c\u7528\u6765\u5339\u914d\u5b57\u7b26\u4e32\u4e2d\u7684\u4e00\u90e8\u5206\uff0c\u4f7f\u7528\u5411\u540e\u5f15\u7528(back reference)\uff0c\u5bf9\u6355\u83b7\u7684\u5206\u7ec4\u8fdb\u884c\u5f15\u7528\u3002 $1\u662fperl\u98ce\u683c\u7684\u540e\u5411\u5f15\u7528 \u5e38\u7528\u6b63\u5219\u8868\u8fbe\u5f0f \u5339\u914d\u57df\u540d grep -oE ‘(([a-zA-Z](-?[a-zA-Z0-9])*)\\.)+[a-zA-Z]{2,}’<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[89],"tags":[],"class_list":["post-6327","post","type-post","status-publish","format-standard","hentry","category-regular-expression"],"_links":{"self":[{"href":"https:\/\/jpuyy.com\/index.php?rest_route=\/wp\/v2\/posts\/6327","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/jpuyy.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/jpuyy.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/jpuyy.com\/index.php?rest_route=\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/jpuyy.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=6327"}],"version-history":[{"count":12,"href":"https:\/\/jpuyy.com\/index.php?rest_route=\/wp\/v2\/posts\/6327\/revisions"}],"predecessor-version":[{"id":8680,"href":"https:\/\/jpuyy.com\/index.php?rest_route=\/wp\/v2\/posts\/6327\/revisions\/8680"}],"wp:attachment":[{"href":"https:\/\/jpuyy.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=6327"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/jpuyy.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=6327"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/jpuyy.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=6327"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}