{"id":192,"date":"2019-09-10T19:42:09","date_gmt":"2019-09-10T11:42:09","guid":{"rendered":"https:\/\/freeapp.sbs\/blog\/?p=192"},"modified":"2025-04-01T17:07:03","modified_gmt":"2025-04-01T08:07:03","slug":"a6ujfwpkr4lxmmx","status":"publish","type":"post","link":"https:\/\/eternalsphere.net\/echoes\/index.php\/2019\/09\/10\/a6ujfwpkr4lxmmx\/","title":{"rendered":"\u6b63\u5219\u8868\u8fbe\u5f0f"},"content":{"rendered":"<ul>\n<li>meta\u5b57\u7b26<\/li>\n<\/ul>\n<p>^ \u951a\u5b9a\u884c\u6216\u5b57\u7b26\u4e32\u7684\u5f00\u59cb<\/p>\n<p>$ \u951a\u5b9a\u884c\u6216\u5b57\u7b26\u4e32\u7684\u7ed3\u675f<\/p>\n<ul>\n<li>\u975e\u6362\u884c\u5b57\u7b26<\/li>\n<\/ul>\n<p>* \u5339\u914d\u591a\u4e2a\u5148\u524d\u5b57\u7b26\u6216\u4e2a\u6570\u4e3a0<\/p>\n<p>[&#8230;] \u5339\u914d\u65b9\u62ec\u53f7\u4e2d\u4efb\u4e00\u5b57\u7b26\u6216\u8303\u56f4[-]<\/p>\n<p>\\ \u6253\u5f00\u6216\u5173\u95ed\u540e\u7eed\u5b57\u7b26\u7684\u7279\u6b8a\u542b\u4e49\uff0cBRE\uff0cERE\u652f\u6301\u4e0d\u540c<\/p>\n<p>B \u00a0\\(\\) \u6807\u8bb0\u5339\u914d\u5b57\u7b26\uff0c\u5c06\\(\u548c\\)\u4e4b\u95f4\u7684\u6a21\u5f0f\u5b58\u50a8\u5728\u4fdd\u7559\u7a7a\u95f4\u4e2d\uff0c\u540e\u7eed\u4f7f\u7528\u8f6c\u4e49\u5e8f\u5217\u5f15\u7528\u5339\u914d\u7684\u6a21\u5f0f<\/p>\n<p>B \u00a0\\n \u91cd\u590d\\(\u4e0e\\)\u5185\u7684\u7b2cn\u4e2a\u6a21\u5f0f<\/p>\n<p>B=E \u00a0x\\{m,n\\} = x{m,n} x\u81f3\u5c11\u51fa\u73b0m\u6b21\uff0c\u6700\u591an\u6b21<\/p>\n<p>+<\/p>\n<p>?<\/p>\n<p>|<\/p>\n<p>()<\/p>\n<ul>\n<li>\u652f\u6301\u6b63\u5219\u8868\u8fbe\u5f0f\u7684\u5de5\u5177<\/li>\n<\/ul>\n<p>grep<\/p>\n<p>sed<\/p>\n<p>awk \u00a0python \u00a0perl \u00a0Tcl<\/p>\n<p>more \u00a0page \u00a0less<\/p>\n<p>ed \u00a0vi \u00a0emacs vim<\/p>\n<ul>\n<li>POSIX BRE\u548cERE\u90fd\u652f\u6301\u7684meta\u5b57\u7b26\uff08\u5143\u5b57\u7b26\uff0c\u7279\u6b8a\u5b57\u7b26\uff09<\/li>\n<\/ul>\n<p>^ \u5339\u914d\u5b57\u7b26\u4e32\u5f00\u59cb<\/p>\n<p>$ \u5339\u914d\u5b57\u7b26\u4e32\u7ed3\u5c3e<\/p>\n<p>. \u5339\u914d\u975e\u6362\u884c\u5b57\u7b26<\/p>\n<p>* \u5339\u914d0\u4e2a\u6216\u591a\u4e2a\u5148\u524d\u5b57\u7b26<\/p>\n<p>[&#8230;] \u5339\u914d\u65b9\u62ec\u53f7\u5185\u4efb\u4e00\u5b57\u7b26\uff0c-\u8868\u793a\u8303\u56f4\uff0c^\u8868\u793a\u6392\u9664<\/p>\n<p>\\ \u6253\u5f00\u6216\u5173\u95ed\u540e\u7eed\u5b57\u7b26\u7684\u7279\u6b8a\u542b\u4e49\uff08\u8f6c\u4e49\uff09<\/p>\n<ul>\n<li>\u652f\u6301\u4e0d\u76f8\u540c\u7684meta\u5b57\u7b26<\/li>\n<\/ul>\n<p>BRE<\/p>\n<p>\\(\\)\u6807\u8bb0\u5339\u914d\u5b57\u7b26\u3002\u4e4b\u95f4\u7684\u6a21\u5f0f\u5b58\u50a8\u5728\u4fdd\u7559\u7a7a\u95f4\uff08Holding Space\uff09\uff0c\u540e\u7eed\u4f7f\u7528\u8f6c\u4e49\u5e8f\u5217\u5f15\u7528<\/p>\n<p>\\n \u91cd\u590d\\(\\)\u4e2d\u7684\u7b2cn\u4e2a\u6a21\u5f0f<\/p>\n<p>x\\{m,n\\} \u5339\u914dx\u51fa\u73b0\u7684\u6b21\u6570<\/p>\n<p>x\\{n\\} n\u6b21<\/p>\n<p>x\\{m,\\} \u81f3\u5c11m\u6b21<\/p>\n<p>x\\{m,n\\} x{m,n} \u00a0\u81f3\u5c11m\u6b21\uff0c\u81f3\u591an\u6b21<\/p>\n<p>ERE<\/p>\n<p>+ \u5339\u914d\u524d\u9762\u6b63\u5219\u8868\u8fbe\u5f0f\u7684\u4e00\u4e2a\u6216\u591a\u4e2a\u5b9e\u4f8b<\/p>\n<p>? 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