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Full Discussion: Perl regular expression
Top Forums Shell Programming and Scripting Perl regular expression Post 302698423 by ragilla on Monday 10th of September 2012 04:41:08 AM
Old 09-10-2012
Hi tyler_durden,

Thanks for your reply, i missed that.
I have one more question. i have code like below , i need to get the text between certain patterns , suppose i have below array

Code:
use strict;
use warnings;
@a = ("my asdf bye", "ram lslkdjfsalf raj");

@a = grep { $_ =~ s/my (.*) bye|ram (.*) raj/$1$2/ } @a;

as first pattern match the required text will be in $1 and As second pattern match the required text will be in $2.

but when first pattern match $2 is empty it will give warning like this
Use of uninitialized value $2 in concatenation (.) or string at

So how to avoid those warnings .. please help me..

thanks in advance
Ragilla
 

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PPIx::Regexp::Token::Code(3pm)				User Contributed Perl Documentation			    PPIx::Regexp::Token::Code(3pm)

NAME
PPIx::Regexp::Token::Code - Represent a chunk of Perl embedded in a regular expression. SYNOPSIS
use PPIx::Regexp::Dumper; PPIx::Regexp::Dumper->new( 'qr{(?{print "hello sailor "})}smx')->print; INHERITANCE
"PPIx::Regexp::Token::Code" is a PPIx::Regexp::Token. "PPIx::Regexp::Token::Code" is the parent of PPIx::Regexp::Token::Interpolation. DESCRIPTION
This class represents a chunk of Perl code embedded in a regular expression. Specifically, it results from parsing things like (?{ code }) (??{ code }) or from the replacement side of an s///e. Technically, interpolations are also code, but they parse differently and therefore end up in a different token. METHODS
This class provides the following public methods. Methods not documented here are private, and unsupported in the sense that the author reserves the right to change or remove them without notice. ppi This convenience method returns the PPI::Document representing the content. This document should be considered read only. SUPPORT
Support is by the author. Please file bug reports at <http://rt.cpan.org>, or in electronic mail to the author. AUTHOR
Thomas R. Wyant, III wyant at cpan dot org COPYRIGHT AND LICENSE
Copyright (C) 2009-2012 by Thomas R. Wyant, III This program is free software; you can redistribute it and/or modify it under the same terms as Perl 5.10.0. For more details, see the full text of the licenses in the directory LICENSES. This program is distributed in the hope that it will be useful, but without any warranty; without even the implied warranty of merchantability or fitness for a particular purpose. perl v5.14.2 2012-06-06 PPIx::Regexp::Token::Code(3pm)
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