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Top Forums Shell Programming and Scripting need to grep contents of a file within specific time span. regex i am using is not working Post 302648621 by elixir_sinari on Wednesday 30th of May 2012 07:15:51 AM
Old 05-30-2012
That's an ERE (extended regular expression) you are using. So, you'll need to use the -E option with grep or use egrep.

A better regex (in your context) would be

Code:
'May 29 15:([01][0-9])|(2[0-3]):[0-5][0-9]'

 

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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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