æ¥æ¾ç®å½ä¸çæææ件ä¸æ¯å¦å«ææ个å符串
æ¥æ¾ç®å½ä¸çæææ件ä¸æ¯å¦å«ææ个å符串
find .|xargs grep -ri "IBM"
æ¥æ¾ç®å½ä¸çæææ件ä¸æ¯å¦å«ææ个å符串,并ä¸åªæå°åºæ件å
find .|xargs grep -ri "IBM" -l
1.æ£å表达å¼
ï¼1ï¼æ£å表达å¼ä¸è¬ç¨æ¥æè¿°ææ¬æ¨¡å¼çç¹æ®ç¨æ³ï¼ç±æ®éå符ï¼ä¾å¦å符a-zï¼ä»¥åç¹æ®å符ï¼ç§°ä¸ºå
å符ï¼å¦/ã*ã?çï¼ç»æã
ï¼2ï¼åºæ¬å
å符éåå
¶å«ä¹
^ ï¼åªå¹é
è¡é¦ã å¦^a å¹é
以aå¼å¤´çè¡abc,a2e,a12,aaa,......
$ ï¼åªå¹é
è¡å°¾ã å¦^a å¹é
以aç»å°¾çè¡bca,12a,aaa,.......
* ï¼å¹é
0个æå¤ä¸ªæ¤åå符ã å¦(a)* å¹é
空ï¼a,aa,aaa,....
[] ï¼åªå¹é
[]å
å符ãå¯ä»¥æ¯ä¸ä¸ªåå符ï¼ä¹å¯ä»¥æ¯å符åºåï¼ç¨","å°éé¢è¦å¹é
çä¸åå符串åå¼ãä¹å¯ä»¥ä½¿ç¨-æ¥è¡¨ç¤º[]å
å符åºåçèå´ï¼å¦[1-5]表示[12345]
\ ï¼åªç¨æ¥å±è½ä¸ä¸ªå
å符çç¹æ®å«ä¹ã å¦\*,\',\",\|,\+,\^,\. ç
.ï¼ï¼ç¹ï¼åªå¹é
ä»»æåå符ã
pattern\{n\}ï¼åªç¨æ¥å¹é
åé¢patternåºç°ç次æ°.n为次æ°ãå¦a\{2\}å¹é
aa.
pattern\{n,\}ï¼å«ä¹åä¸ï¼ä½æ¬¡æ°æå°ä¸ºn.å¦a\{2,\}å¹é
aa,aaa,aaaa,.....
pattern\{n,m\}ï¼å«ä¹åä¸ï¼ä½æ¬¡æ°å¨nåmä¹é´ãå¦a\{2,4\}å¹é
aa,aaa,aaaaä¸ä¸ª
(3)举ä¾è¯´æï¼
^$ ï¼å¹é
空è¡
^.$ ï¼å¹é
å
å«ä¸ä¸ªå符çè¡
\*\.pas ï¼å¹é
以*.pasç»å°¾çææå符ææ件
[0123456789]æ[0-9] ï¼åå®è¦å¹é
ä»»æä¸ä¸ªæ°å
[a-z] ï¼ä»»æå°ååæ¯
[A-Za-z] ï¼ä»»æ大å°ååæ¯
[S,s] ï¼å¹é
大å°åS
[0-9]\{3\}\.[0-9]\{3\}\.[0-9]\{3\}\.[0-9]\{3\} ï¼å¹é
IPå°å [0-9]\{3\}ä¸ä¸ª0-9ç»æçå符串ï¼\. ï¼å¹é
ç¹ï¼æ³¨æè¿éç¹æ¯ç¹æ®çå符ï¼æ以è¦ç¨"\"æ¥å±è½å
¶å«ä¹ï¼
温馨提示:答案为网友推荐,仅供参考