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Full Discussion: Grep regex to ignore sequence only if surrounded by fwd-slashes
Top Forums Shell Programming and Scripting Grep regex to ignore sequence only if surrounded by fwd-slashes Post 302877469 by disedorgue on Sunday 1st of December 2013 03:08:24 PM
Old 12-01-2013
Hi,
Or, if your grep have -P option, you can reduct one regex:
Code:
$ cat file
a) "11.11.11.11"               --> This should match "11.11.11.11"
b) "lots12.11.11.11lots"       --> This should match "12.11.11.11"
c) "lots1311.11.11.1111lots"   --> This should match "1311.11.11.1111" (see P.S. for why)
d) "lots/14.11.11.11/lots"     --> This should NOT match anything

e) "lots15.11.11.11lots then lots http://url/1.6.1.0/file.js"
16.11.11.11a
a17.11.11.11
18.11.11.11

Code:
$ grep -Po "(^|[^/0-9])\K[0-9]+\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]+(?=([^/0-9]|$))" file
11.11.11.11
11.11.11.11
12.11.11.11
12.11.11.11
1311.11.11.1111
1311.11.11.1111
15.11.11.11
16.11.11.11
17.11.11.11
18.11.11.11

Regards.
This User Gave Thanks to disedorgue For This Post:
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LEARN ABOUT POSIX

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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