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Shell Programming and Scripting
Perl pattern matching!!
Post 302357484 by nmattam on Wednesday 30th of September 2009 02:09:32 AM
09-30-2009
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i can only find the first occurance of a pattern how do i set it to loop untill all occurances have changed.
#! /usr/bin/perl
use POSIX;
open (DFH_FILE, "./dfh") or die "Can not read file ($!)";
foreach (<DFH_FILE>) {
if ($_ !~ /^#|^$/) {
chomp;
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Hi,
I got doubt in Pattern matching, could you tell me how the following differs in action ??
if ( $line1==/$line2/ )
if ( $line1=~/$line2/ )
if ( $line1=~m/$line2/)
What is the significance of '~' in matching.
Thanks in advance
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----------
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LEARN ABOUT DEBIAN
perl::critic::policy::builtinfunctions::requireblockgrep
Perl::Critic::Policy::BuiltinFunctions::RequireBlockGrepUser)Contributed Perl DocumenPerl::Critic::Policy::BuiltinFunctions::RequireBlockGrep(3pm) NAME
Perl::Critic::Policy::BuiltinFunctions::RequireBlockGrep - Write "grep { $_ =~ /$pattern/ } @list" instead of "grep /$pattern/, @list". AFFILIATION
This Policy is part of the core Perl::Critic distribution. DESCRIPTION
The expression forms of "grep" and "map" are awkward and hard to read. Use the block forms instead. @matches = grep /pattern/, @list; #not ok @matches = grep { /pattern/ } @list; #ok @mapped = map transform($_), @list; #not ok @mapped = map { transform($_) } @list; #ok CONFIGURATION
This Policy is not configurable except for the standard options. SEE ALSO
Perl::Critic::Policy::BuiltinFunctions::ProhibitStringyEval Perl::Critic::Policy::BuiltinFunctions::RequireBlockMap AUTHOR
Jeffrey Ryan Thalhammer <jeff@imaginative-software.com> COPYRIGHT
Copyright (c) 2005-2011 Imaginative Software Systems. All rights reserved. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. The full text of this license can be found in the LICENSE file included with this module. perl v5.14.2 2012-06-07 Perl::Critic::Policy::BuiltinFunctions::RequireBlockGrep(3pm)