\u6b63\u5219\u8868\u8fbe\u5f0f\u5e38\u89c1\u64cd\u4f5c,\u8fd9\u91cc\u4e5f\u5f15\u7528\u9e1f\u54e5\u79c1\u623f\u83dc\u4e2d\u63d0\u53ca\u7684,\u9e1f\u54e5\u7f16\u8f91\u7684txt\u6587\u6863.<\/p>\n
\u6587\u6863\u4e0b\u8f7d\u5730\u5740:<\/p>\n
wget\u00a0https:\/\/linux.vbird.org\/linux_basic\/0330regularex\/regular_express.txt<\/p>\n
\u9700\u8981\u8bb0\u4f4f\u7684\u7279\u6b8a\u7b26\u53f7,\u5982\u4e0b:<\/p>\n
[:alnum:]\u00a0:\u00a0\u4ee3\u8868\u82f1\u6587\u5927\u5c0f\u5199\u5b57\u7b26\u53ca\u6570\u5b57,\u53730-9,A-Z,a-z;<\/p>\n
[:alpha:]\u00a0:\u00a0\u4ee3\u8868\u82f1\u6587\u5927\u5c0f\u5199\u5b57\u7b26,\u5373a-z,A-Z;<\/p>\n
[:blank:]\u00a0:\u00a0\u4ee3\u8868\u7a7a\u683c\u952e\u4e0eTab\u6309\u952e;<\/p>\n
[:cntrl:]\u00a0:\u00a0\u4ee3\u8868\u952e\u76d8\u4e0a\u9762\u7684\u63a7\u5236\u6309\u952e,\u5373\u5305\u62ecCR,LF,Tab,Del\u7b49;<\/p>\n
[:digit:]\u00a0:\u00a0\u4ee3\u8868\u6570\u5b57,\u53730-9;<\/p>\n
[:graph:]\u00a0:\u00a0\u9664\u4e86\u7a7a\u683c\u7b26(\u7a7a\u683c\u952e\u4e0eTab\u6309\u952e)\u5916\u7684\u5176\u4ed6\u6240\u6709\u6309\u952e;<\/p>\n
[:lower:]\u00a0:\u00a0\u4ee3\u8868\u5c0f\u5199\u5b57\u7b26,\u5373a-z;<\/p>\n
[:print:]\u00a0:\u00a0\u4ee3\u8868\u53ef\u4ee5\u88ab\u6253\u5370\u51fa\u6765\u7684\u5b57\u7b26;<\/p>\n
[:punct:]\u00a0:\u00a0\u4ee3\u8868\u6807\u70b9\u5b57\u7b26,\u5373\u201d\u00a0?\u00a0!\u00a0#\u00a0$\u7b49;<\/p>\n
[:upper:]\u00a0:\u00a0\u4ee3\u8868\u5927\u5199\u5b57\u7b26,\u5373A-Z;<\/p>\n
[:space:]\u00a0:\u00a0\u4efb\u4f55\u4f1a\u4ea7\u751f\u7a7a\u767d\u7684\u5b57\u7b26,\u5305\u62ec\u7a7a\u683c\u952eTab\u00a0CR\u7b49;<\/p>\n
[:xdigit:]\u00a0:\u00a0\u4ee3\u8868\u5341\u516d\u8fdb\u5236\u7684\u6570\u5b57\u7c7b\u578b,\u56e0\u6b64\u5305\u62ec0-9,\u00a0A-F,\u00a0a-f\u7684\u6570\u5b57\u548c\u5b57\u7b26;<\/p>\n
\u9700\u8981\u8bb0\u4f4f\u7684RE\u7279\u6b8a\u5b57\u7b26,\u5982\u4e0b<\/p>\n
^word\u00a0:\u00a0\u5f85\u67e5\u627e\u7684\u5b57\u7b26\u4e32word\u5728\u884c\u9996;<\/p>\n
word$\u00a0:\u00a0\u5f85\u67e5\u627e\u7684\u5b57\u7b26\u4e32word\u00a0\u5728\u884c\u5c3e;<\/p>\n
.\u00a0\u00a0\u00a0\u00a0\u00a0 :\u00a0\u4ee3\u8868\u4e00\u5b9a\u6709\u4e00\u4e2a\u4efb\u610f\u5b57\u7b26\u7684\u5b57\u7b26;<\/p>\n
\\\u00a0\u00a0\u00a0\u00a0\u00a0 :\u00a0\u8f6c\u4e49\u5b57\u7b26,\u5c06\u7279\u6b8a\u7b26\u53f7\u7684\u7279\u6b8a\u610f\u4e49\u53bb\u9664;<\/p>\n
* \u00a0 \u00a0 :\u00a0\u91cd\u590d0\u4e2a\u5230\u65e0\u7a77\u591a\u4e2a\u524d\u4e00\u4e2a\u5b57\u7b26;<\/p>\n
[list]\u00a0 :\u00a0\u4ece\u5b57\u7b26\u96c6\u5408\u7684RE\u5b57\u7b26\u91cc\u9762\u627e\u51fa\u60f3\u8981\u9009\u53d6\u7684\u5b57\u7b26;<\/p>\n
[n1-n2]\u00a0:\u00a0\u4ece\u5b57\u7b26\u96c6\u5408\u7684RE\u5b57\u7b26\u91cc\u9762\u627e\u51fa\u60f3\u8981\u9009\u53d6\u7684\u5b57\u7b26\u8303\u56f4;<\/p>\n
[^list]\u00a0:\u00a0\u4ece\u5b57\u7b26\u96c6\u5408\u7684RE\u5b57\u7b26\u91cc\u9762\u627e\u51fa\u4e0d\u60f3\u8981\u5b57\u7b26\u4e32\u6216\u8303\u56f4;<\/p>\n
\\{\\n,m}\u00a0:\u00a0\u8fde\u7eedn\u5230m\u4e2a\u524d\u4e00\u4e2aRE\u5b57\u7b26,\u82e5\u4e3a\\{n\\}\u5219\u662f\u8fde\u7eedn\u4e2a\u7684\u524d\u4e00\u4e2aRE\u5b57\u7b26,\u82e5\u4e3a\\{n,\\}<\/p>\n
\u5219\u662f\u8fde\u7eedn\u4e2a\u4ee5\u4e0a\u7684\u524d\u4e00\u4e2aRE\u5b57\u7b26.<\/p>\n
\u5b9e\u4f8b1:\u67e5\u627e\u7279\u5b9a\u5b57\u7b26\u4e32<\/p>\n
\u8fd9\u91cc\u4ee5\u201dthe\u201d\u8fd9\u4e2a\u7279\u5b9a\u5b57\u7b26\u4e32\u4e3a\u4f8b,\u5982\u4e0b:<\/p>\n
#\u00a0grep\u00a0-n\u00a0“the”\u00a0regular_express.txt<\/p>\n
8:I\u00a0can’t\u00a0finish\u00a0the\u00a0test.<\/p>\n
12:the\u00a0symbol\u00a0‘*’\u00a0is\u00a0represented\u00a0as\u00a0start.<\/p>\n
15:You\u00a0are\u00a0the\u00a0best\u00a0is\u00a0mean\u00a0you\u00a0are\u00a0the\u00a0no.\u00a01.<\/p>\n
16:The\u00a0world\u00a0<Happy>\u00a0is\u00a0the\u00a0same\u00a0with\u00a0“glad”.<\/p>\n
18:google\u00a0is\u00a0the\u00a0best\u00a0tools\u00a0for\u00a0search\u00a0keyword.<\/p>\n
\u82e5\u60f3\u53cd\u5411\u9009\u62e9,\u4e5f\u5c31\u662f\u663e\u793a\u51fa\u6ca1\u6709\u201dthe\u201d\u5b57\u7b26\u4e32\u7684\u884c,\u5c31\u53ef\u4ee5\u4f7f\u7528-v\u9009\u9879,\u5982\u4e0b:<\/p>\n
#\u00a0grep\u00a0-vn\u00a0“the”\u00a0regular_express.txt<\/p>\n
\u82e5\u60f3\u663e\u793a\u50cf\u201dThe\u201d\u3001\u201dTHE\u201d\u7b49\u5b57\u7b26\u4e32,\u5c31\u53ef\u4ee5\u4f7f\u7528-i\u9009\u9879,\u6765\u5ffd\u7565\u5927\u5c0f\u5199,\u5982\u4e0b:<\/p>\n
#\u00a0grep\u00a0-in\u00a0“the”\u00a0regular_express.txt<\/p>\n
\u5b9e\u4f8b2:\u5229\u7528\u4e2d\u62ec\u53f7[]\u6765\u67e5\u627e\u96c6\u5408\u5b57\u7b26<\/p>\n
[]\u4e2d\u4e0d\u8bba\u6709\u51e0\u4e2a\u5b57\u7b26,\u5b83\u90fd\u53ea\u4ee3\u8868\u67d0\u201d\u4e00\u4e2a\u201d\u5b57\u7b26,\u5982\u6211\u4eec\u67e5\u627etest\u00a0\u548ctast\u8fd9\u4e24\u4e2a\u5b57\u7b26\u4e32\u65f6,\u53ef\u4ee5\u5982\u4e0b:<\/p>\n
#\u00a0grep\u00a0-n\u00a0“t[ae]st”\u00a0regular_express.txt<\/p>\n
8:I\u00a0can’t\u00a0finish\u00a0the\u00a0test.<\/p>\n
9:Oh!\u00a0The\u00a0soup\u00a0taste\u00a0good.<\/p>\n
\u82e5\u6211\u4eec\u60f3\u67e5\u627e\u6709oo\u5b57\u7b26\u4e32\u7684\u884c,\u5982\u4e0b:<\/p>\n
#\u00a0grep\u00a0-n\u00a0“oo”\u00a0regular_express.txt<\/p>\n
\u540c\u4e0a,\u82e5\u4e0d\u60f3oo\u524d\u6709g\u8fd9\u4e2a\u5b57\u7b26\u7684\u8bdd,\u53ef\u4ee5\u5982\u4e0b:<\/p>\n
#\u00a0grep\u00a0-n\u00a0“[^g]oo”\u00a0regular_express.txt<\/p>\n
\u540c\u4e0a,\u82e5\u4e0d\u60f3oo\u524d\u9762\u6709\u5c0f\u5199\u5b57\u7b26,\u53ef\u4ee5\u5982\u4e0b;<\/p>\n
#\u00a0grep\u00a0-n\u00a0“[^a-z]oo”\u00a0regular_express.txt<\/p>\n
\u6216\u8005\u4f7f\u7528\u7279\u6b8a\u5b57\u7b26,\u5982\u4e0b:<\/p>\n
#\u00a0grep\u00a0-n\u00a0“[^[:lower:]]oo”\u00a0regular_express.txt<\/p>\n
\u540c\u4e0a,\u82e5\u60f3\u67e5\u627e\u6709\u6570\u5b57\u7684\u884c,\u53ef\u4ee5\u5982\u4e0b:<\/p>\n
#\u00a0grep\u00a0-n\u00a0“[0-9]”\u00a0regular_express.txt<\/p>\n
\u6216\u8005\u4f7f\u7528\u7279\u6b8a\u5b57\u7b26,\u5982\u4e0b:<\/p>\n
#\u00a0grep\u00a0-n\u00a0“[[:digit:]]”\u00a0regular_express.txt<\/p>\n
\u5b9e\u4f8b3:\u884c\u9996\u4e0e\u884c\u5c3e\u5b57\u7b26^$<\/p>\n
\u82e5\u6211\u4eec\u60f3\u5217\u51fa\u5f00\u5934\u662f\u5c0f\u5199\u5b57\u7b26\u7684\u884c,\u53ef\u4ee5\u5982\u4e0b:<\/p>\n
#\u00a0grep\u00a0-n\u00a0\u201c^[a-z]\u201d\u00a0regular_express.txt<\/p>\n
\u82e5\u6211\u4eec\u60f3\u5217\u51fa\u7ed3\u5c3e\u662f\u5c0f\u6570\u70b9(.)\u7684\u884c,\u7279\u522b\u6ce8\u610f,\u5c0f\u6570\u70b9\u5177\u6709\u5176\u4ed6\u610f\u4e49,\u5fc5\u987b\u4f7f\u7528\u8f6c\u4e49\u5b57\u7b26(\\)\u6765\u52a0\u4ee5\u89e3\u9664\u5176\u7279\u6b8a\u610f\u4e49.\u5982\u4e0b<\/p>\n
#\u00a0grep\u00a0-n\u00a0\u201c\\.$\u201d\u00a0regular_express.txt<\/p>\n
\u82e5\u60f3\u663e\u793a\u201d\u7a7a\u767d\u884c\u201d,\u53ef\u4ee5\u5982\u4e0b:<\/p>\n
#\u00a0grep\u00a0-n\u00a0\u201c^$\u201d\u00a0regular_express.txt<\/p>\n
\u7279\u522b\u5f88\u591a\u65f6\u5019,\u6211\u4eec\u67e5\u770b\u6587\u4ef6\u65f6,\u4e0d\u60f3\u663e\u793a\u201d\u7a7a\u767d\u884c\u201d\u548c\u201d#\u6ce8\u91ca\u884c\u201d,\u53ef\u4ee5\u5982\u4e0b:<\/p>\n
#\u00a0grep\u00a0-v\u00a0“^$”\u00a0regular_express.txt\u00a0|\u00a0grep\u00a0-v\u00a0“^#”<\/p>\n
\u82e5\u4e0d\u60f3\u5f00\u5934\u662f\u82f1\u6587\u5b57\u6bcd,\u53ef\u4ee5\u8fd9\u6837:<\/p>\n
#\u00a0grep\u00a0-n\u00a0“^[^a-zA-Z]”\u00a0regular_express.txt<\/p>\n
\u7279\u522b\u6ce8\u610f,\u90a3\u4e2a^\u7b26\u53f7\u5728\u5b57\u7b26\u96c6\u5408\u7b26\u53f7(\u4e2d\u62ec\u53f7[])\u4e4b\u5185\u4e0e\u4e4b\u5916\u662f\u4e0d\u540c\u7684!\u5728[]\u5185\u4ee3\u8868\u201d\u53cd\u5411\u9009\u62e9\u201d,\u5728[\u4e4b\u5916\u5219\u4ee3\u8868\u5b9a\u4f4d\u5728\u884c\u9996\u7684\u610f\u4e49.]<\/p>\n
\u5b9e\u4f8b4:\u4efb\u610f\u4e00\u4e2a\u5b57\u7b26\u00a0.\u00a0\u4e0e\u91cd\u590d\u5b57\u7b26*<\/p>\n
\u5728bash\u4e2d,\u901a\u914d\u7b26*\u53ef\u4ee5\u7528\u6765\u4ee3\u8868\u4efb\u610f(0\u6216\u591a\u4e2a)\u5b57\u7b26,\u4f46\u662f\u6b63\u5219\u8868\u8fbe\u5f0f\u5e76\u4e0d\u662f\u901a\u914d\u7b26,\u4e24\u8005\u4e4b\u95f4\u662f\u4e0d\u540c\u7684.\u81f3\u4e8e\u6b63\u5219\u8868\u8fbe\u5f0f\u5f53\u4e2d,\u201d.\u201d\u5219\u4ee3\u8868\u7edd\u5bf9\u6709\u4e00\u4e2a\u4efb\u610f\u5b57\u7b26\u7684\u610f\u601d.<\/p>\n
.(\u5c0f\u6570\u70b9)\u00a0:\u00a0\u4ee3\u8868\u4e00\u5b9a\u6709\u4e00\u4e2a\u4efb\u610f\u5b57\u7b26\u7684\u610f\u601d;<\/p>\n
*(\u661f\u53f7)\u00a0:\u00a0\u4ee3\u8868\u91cd\u590d\u524d\u4e00\u4e2a0\u5230\u65e0\u7a77\u591a\u6b21\u7684\u610f\u601d,\u4e3a\u7ec4\u5408\u5f62\u6001;<\/p>\n
\u82e5\u6211\u4eec\u60f3\u8981\u627e\u51fag??d\u7684\u5b57\u7b26\u4e32,\u5373\u5171\u6709\u56db\u4e2a\u5b57\u7b26,\u6211\u4eec\u53ef\u4ee5\u8fd9\u6837:<\/p>\n
#\u00a0grep\u00a0-n\u00a0“g..d”\u00a0regular_express.txt<\/p>\n
\u56e0\u4e3a*\u4ee3\u8868\u7684\u662f\u91cd\u590d0\u6216\u591a\u4e2a\u524d\u9762\u7684RE\u5b57\u7b26\u7684\u610f\u4e49,\u56e0\u6b64,\u201do*\u201d\u4ee3\u8868\u7684\u662f\u5177\u6709\u7a7a\u5b57\u7b26\u6216\u4e00\u4e2ao\u4ee5\u4e0a\u7684\u5b57\u7b26,\u7279\u522b\u6ce8\u610f,\u56e0\u4e3a\u5141\u8bb8\u7a7a\u5b57\u7b26,\u56e0\u6b64,\u201d#\u00a0grep\u00a0-n\u00a0“o*”\u00a0regular_express.txt\u00a0\u201d\u5c06\u4f1a\u628a\u6240\u6709\u7684\u6570\u636e\u90fd\u5217\u51fa\u6765.<\/p>\n
\u90a3\u5982\u679c\u201doo*\u201d\u5462?\u5219\u7b2c\u4e00\u4e2ao\u80af\u5b9a\u5fc5\u987b\u5b58\u5728,\u7b2c\u4e8c\u4e2ao\u5219\u662f\u53ef\u6709\u53ef\u65e0\u7684\u591a\u4e2ao,\u6240\u4ee5\u542b\u6709o,\u00a0oo,\u00a0ooo\u7b49,\u90fd\u53ef\u4ee5\u5217\u51fa\u6765.<\/p>\n
\u53ef\u4ee5\u8fd9\u6837:<\/p>\n
#\u00a0grep\u00a0-n\u00a0“ooo*”\u00a0regular_express.txt<\/p>\n
#\u00a0grep\u00a0-n\u00a0“goo*d”\u00a0regular_express.txt<\/p>\n
\u82e5\u60f3\u5217\u51fag\u5f00\u5934\u4e0eg\u7ed3\u5c3e\u7684\u5b57\u7b26\u4e32\u5462?\u53ef\u4ee5\u5982\u4e0b:<\/p>\n
#\u00a0grep\u00a0-n\u00a0“g.*g”\u00a0regular_express.txt<\/p>\n
g\u5f00\u5934\u8bedg\u7ed3\u5c3e,\u5373\u8868\u793ag…g\u8fd9\u6837\u7684\u5b57\u7b26\u4e32,\u53ef\u4ee5\u4f7f\u7528\u201d.*\u201d\u6765\u4ee3\u88680\u4e2a\u6216\u4efb\u610f\u5b57\u7b26\u7684\u610f\u601d.<\/p>\n
\u5b9e\u4f8b5:\u9650\u5b9a\u8fde\u7eedRE\u5b57\u7b26\u8303\u56f4{}<\/p>\n
\u82e5\u6211\u4eec\u60f3\u8981\u627e\u51fa2-5\u4e2ao\u7684\u8fde\u7eed\u5b57\u7b26\u4e32,\u8be5\u5982\u4f55\u505a?\u8fd9\u65f6\u5019\u5c31\u5f97\u8981\u4f7f\u7528\u5230\u9650\u5b9a\u8303\u56f4\u7684\u5b57\u7b26{}\u4e86.\u4f46\u56e0\u4e3a{\u4e0e}\u7684\u7b26\u53f7\u5728shell\u662f\u6709\u7279\u6b8a\u610f\u4e49\u7684,\u56e0\u6b64,\u6211\u4eec\u5fc5\u987b\u8981\u4f7f\u7528\u8f6c\u4e49\u5b57\u7b26\\\u6765\u8ba9\u5b83\u5931\u53bb\u7279\u6b8a\u610f\u4e49\u624d\u884c.\u5982\u4e0b:<\/p>\n
\u67e5\u627e\u4e24\u4e2ao\u7684\u5b57\u7b26\u4e32,\u53ef\u4ee5\u8fd9\u6837:<\/p>\n
#\u00a0grep\u00a0-n\u00a0“o\\{2\\}”\u00a0regular_express.txt<\/p>\n
\u82e5\u60f3\u67e5\u627eg\u540e\u9762\u63a52\u52305\u4e2ao,\u7136\u540e\u518d\u63a5\u4e00\u4e2ag\u7684\u5b57\u7b26\u4e32\u5462?\u53ef\u4ee5\u8fd9\u6837:<\/p>\n
#\u00a0grep\u00a0-n\u00a0“o\\{2,5\\}g”\u00a0regular_express.txt<\/p>\n","protected":false},"excerpt":{"rendered":"
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