grep regular expression space
Make sure you quote your expression. I think shell wordsplitting is one of your problems here, but you should always quote your regex, as all ..., Use the + regex character, which will match at least one of the preceding character: grep -E "word +-c" abc.txt. This regex reads "match 'word', ..., This looks like a behavior difference in the handling of -s between grep 2.5 and newer versions (a bug in old grep?). I confirm your result with ..., Take a look at your grep manpage. Perl added a lot of regular expression extensions that weren't in the original specification. However ..., Try grep -oP 'mem-s*=-s*-K[0-9]+' file. The -K simply drops everything matched so far, printing only the number. This alternative to a look-behind ..., ... preceded by a space and not followed by a space. Also, it's worth noting that not all versions of grep support '-s' regular expression controls., Hello All, I am trying to match white space in patterns through - Grep I tried [[:space:]] & [[:blank:]] but none of them worked. Then I tried Per | The ...,... my experience grep works best with POSIX character classes - look up [[:space:]] for instance. I use grep extensively in some programs for user input validation ... ,[[:space:]] – Space characters: tab, newline, vertical tab, form feed, carriage return, and space. [[:upper:]] – Upper-case letters: ' ...
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 grep regular expression space 相關參考資料
command line - How to include a space character with grep ...
Make sure you quote your expression. I think shell wordsplitting is one of your problems here, but you should always quote your regex, as all ... https://askubuntu.com Grep unknown number of spaces (linux) - Stack Overflow
Use the + regex character, which will match at least one of the preceding character: grep -E "word +-c" abc.txt. This regex reads "match 'word', ... https://stackoverflow.com grep regex whitespace behavior - Stack Overflow
This looks like a behavior difference in the handling of -s between grep 2.5 and newer versions (a bug in old grep?). I confirm your result with ... https://stackoverflow.com grep with regexp: whitespace doesn't match unless I add an ...
Take a look at your grep manpage. Perl added a lot of regular expression extensions that weren't in the original specification. However ... https://stackoverflow.com allow for zero or more spaces in regex with grep - Stack ...
Try grep -oP 'mem-s*=-s*-K[0-9]+' file. The -K simply drops everything matched so far, printing only the number. This alternative to a look-behind ... https://stackoverflow.com How to find a space in a text. using grep? - Unix & Linux Stack ...
... preceded by a space and not followed by a space. Also, it's worth noting that not all versions of grep support '-s' regular expression controls. https://unix.stackexchange.com Matching white space through Grep - UNIX and Linux Forums
Hello All, I am trying to match white space in patterns through - Grep I tried [[:space:]] & [[:blank:]] but none of them worked. Then I tried Per | The ... https://www.unix.com Dealing with whitespace in grep - Super User
... my experience grep works best with POSIX character classes - look up [[:space:]] for instance. I use grep extensively in some programs for user input validation ... https://superuser.com Regular expressions in grep ( regex ) with examples - nixCraft
[[:space:]] – Space characters: tab, newline, vertical tab, form feed, carriage return, and space. [[:upper:]] – Upper-case letters: ' ... https://www.cyberciti.biz |