Grep Regular Expression note

Grep Regular Expression Note: 20130921 23:49:18 221.179.36.27 http: // dsfafdfessafsdfasdaf/search.htm? Q = % E5 % A5 % B3 % E8 % A3 % 85% E7 % A7 % 8B % E8 % A3 % 85% E8 % BF % 9E % E8 % A1 % A3 % E8 % A3 % 99 & pid = momo_mZPlutzDp9DL30q0-QuSNg & s8safbdo.com 200 46175 A2E08AFDAB132C1800011CSY cmwap 10.114.215.79 GPRS/edge get application/vnd.wap.xhtml + xml; charset = UTF-8 1 NONE Mozilla/5.0 (Linux; U; Android 4.1.1; zh-CN; DXG111_3 Build/JRO03C) AppleWebKit/534.31 (KHTML, like Gecko) UCBrowser/9.2.4.329 U3/0.8. 0 Mobile Safari/534.31 01 63632 52176 1. Search for 1 NONE: grep-Ec '[\ d \ D] * (1 \ s * NONE) [\ d \ D] * 'wk_access.log.20130921v.tmp 2. Search for '01: grep-C' [[: space:] 01 [[: space:] 'wk_access.log.20130921v.tmp involves knowledge points: grep basic regular expressions, extended regular expressions, posix characters in order to keep one to one character encoding in different countries, POSIX (The Portable Operating SystemInterface) added Special Character classes, such as [: alnum:], which is another way of writing a A-Za-z0-9. Put them in the [] sign to become a regular expression, such as [A-Za-z0-9] or [[: alnum:]. In linux, grep supports POSIX character classes except fgrep. [: Alnum:] character [: alpha:] character [: digit:] digit character [: graph:] non-null character (non-space, control character )[: lower:] lowercase character [: cntrl:] control character [: print:] non-empty character (including space) [: punct:] punctuation [: space:] all blank characters (new lines, spaces, tabs) [: upper:] uppercase characters [: xdigit:] hexadecimal numbers (0-9, a-f, A-F)