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Full Discussion: Regular exp in awk
Top Forums Shell Programming and Scripting Regular exp in awk Post 302447400 by gvj on Monday 23rd of August 2010 05:11:59 AM
Old 08-23-2010
Regular exp in awk

Hi all,
One small doubt, reg exp in awk, is it possible to extract the match of regular expression like in perl?

eg:
B R16288 Map3_NoCat
B R16067 Map4_NoCat
B R16647 Map3_NoCat
B R16450 Map3_NoCat
B R16106 Map6_NoCat
B R16000 Map3_NoCat
B R16395 Map3_NoCat
B R16243 Map3_NoCat
B R16023 Map12_NoCat
B R16421 Map3_NoCat

if I wanna extract the digits after Map, in perl I could say

Code:
 /Map(\d*)/  print $1

is there any direct way in awk for it?
 

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English(3pm)						 Perl Programmers Reference Guide					      English(3pm)

NAME
English - use nice English (or awk) names for ugly punctuation variables SYNOPSIS
use English; use English qw( -no_match_vars ) ; # Avoids regex performance penalty # in perl 5.16 and earlier ... if ($ERRNO =~ /denied/) { ... } DESCRIPTION
This module provides aliases for the built-in variables whose names no one seems to like to read. Variables with side-effects which get triggered just by accessing them (like $0) will still be affected. For those variables that have an awk version, both long and short English alternatives are provided. For example, the $/ variable can be referred to either $RS or $INPUT_RECORD_SEPARATOR if you are using the English module. See perlvar for a complete list of these. PERFORMANCE
NOTE: This was fixed in perl 5.20. Mentioning these three variables no longer makes a speed difference. This section still applies if your code is to run on perl 5.18 or earlier. This module can provoke sizeable inefficiencies for regular expressions, due to unfortunate implementation details. If performance matters in your application and you don't need $PREMATCH, $MATCH, or $POSTMATCH, try doing use English qw( -no_match_vars ) ; . It is especially important to do this in modules to avoid penalizing all applications which use them. perl v5.18.2 2014-01-06 English(3pm)
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