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Top Forums Shell Programming and Scripting Regexp help -- (a*)(b*|(ab)*) and (a*)((b|ab)*) on "aabab" Post 302300166 by radoulov on Monday 23rd of March 2009 11:30:00 AM
Old 03-23-2009
It depends, different regular expressions engines work differently:

Code:
% perl -ple's/(a*)(b*|(ab)*)/-->$1<-- -->$2<--/'<<<aabab
-->aa<-- -->b<--ab
% sed -r 's/(a*)(b*|(ab)*)/-->\1<-- -->\2<--/'<<<aabab  
-->a<-- -->abab<--
% awk '{print gensub(/(a*)(b*|(ab)*)/,"-->\\1<-- -->\\2<--",1)}'<<<aabab
-->a<-- -->abab<--

 

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XML::LibXML::RegExp(3)					User Contributed Perl Documentation				    XML::LibXML::RegExp(3)

NAME
XML::LibXML::RegExp - XML::LibXML::RegExp - interface to libxml2 regular expressions SYNOPSIS
use XML::LibXML; my $compiled_re = XML::LibXML::RegExp->new('[0-9]{5}(-[0-9]{4})?'); if ($compiled_re->isDeterministic()) { ... } if ($compiled_re->matches($string)) { ... } $compiled_re = XML::LibXML::RegExp->new( $regexp_str ); $bool = $compiled_re->matches($string); $bool = $compiled_re->isDeterministic(); DESCRIPTION
This is a perl interface to libxml2's implementation of regular expressions, which are used e.g. for validation of XML Schema simple types (pattern facet). new() $compiled_re = XML::LibXML::RegExp->new( $regexp_str ); The constructor takes a string containing a regular expression and returns a compiled regexp object. matches($string) $bool = $compiled_re->matches($string); Given a string value, returns a true value if the value is matched by the compiled regular expression. isDeterministic() $bool = $compiled_re->isDeterministic(); Returns a true value if the regular expression is deterministic; returns false otherwise. (See the definition of determinism in the XML spec (<http://www.w3.org/TR/REC-xml/#determinism>)) AUTHORS
Matt Sergeant, Christian Glahn, Petr Pajas VERSION
2.0018 COPYRIGHT
2001-2007, AxKit.com Ltd. 2002-2006, Christian Glahn. 2006-2009, Petr Pajas. perl v5.16.3 2013-05-13 XML::LibXML::RegExp(3)
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