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Full Discussion: How to grep substring from a line ?
Top Forums Shell Programming and Scripting How to grep substring from a line ? Post 302249383 by wempy on Tuesday 21st of October 2008 08:24:23 AM
Old 10-21-2008
sed --version
GNU sed version 4.1.5

Code:
echo "This is the TEST(Message(with some tricky word)) from which i want to search." \ 
| sed 's/.*TEST(\{1\}\(.*\))\{1,\}.*$/\1/'

explanation:
.* - look for any number of any character (including none)
TEST - followed by TEST
(\{1\} - followed by 1 ( [and only 1, if you want it to match more than 1 use \{1,\}]
\( - remember what you match from now on
.* - look for any number of any character (including none)
\) - end remembering matches
)\{1,\} - followed by 1 or more )
.*$ - followed by 0 or more characters to the end of the line

s/<regex>/\1/ - will substitute (s) what the regex matches, with the first remembered item from the regex.

so all that outputs
Code:
Message(with some tricky word)

 

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LEARN ABOUT PHP

zgrep

ZGREP(1)						      General Commands Manual							  ZGREP(1)

NAME

       zgrep - search possibly compressed files for a regular expression

SYNOPSIS

       zgrep [ grep_options ] [ -e ] pattern filename...

DESCRIPTION

       Zgrep  invokes  grep  on  compressed  or  gzipped  files.   These  grep	options  will  cause  zgrep  to  terminate  with  an  error  code:
       (-[drRzZ]|--di*|--exc*|--inc*|--rec*|--nu*).  All other options specified are passed directly to grep.  If no file is specified,  then  the
       standard input is decompressed if necessary and fed to grep.  Otherwise the given files are uncompressed if necessary and fed to grep.

       If the GREP environment variable is set, zgrep uses it as the grep program to be invoked.

EXIT CODE

       2 - An option that is not supported was specified.

AUTHOR

       Charles Levert (charles@comm.polymtl.ca)

SEE ALSO

       grep(1), gzexe(1), gzip(1), zdiff(1), zforce(1), zmore(1), znew(1)

																	  ZGREP(1)
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