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Top Forums Shell Programming and Scripting Non-greedy pattern matching in shell script Post 302910861 by Zel2008 on Monday 28th of July 2014 04:11:19 PM
Old 07-28-2014
Non-greedy pattern matching in shell script

Hi all,

Is Perl included by default in Ubuntu? I'm trying to write a program using as few languages as possible, and since I'm using a few Perl one-liners to do non-greedy matching, it's considered another language, and this is a bad thing.

Basically, I'm using a Perl one-liner to grab XML between tags, where $2 is the name of the tag and $3 is the nth tag with that name:
Code:
perl -pe "s/(.*?<$2>){$3}(.*?)<\/$2>.*/\2/"

To escape forward slashes in XML:
Code:
content=$(echo "$4" | perl -pe "s/<\//<\\\\\//")

And to grab an XML tag based on both its tag and content, where $2 is the name of the tag, $3 is the nth tag with that name, and $content is an XML string escaped as above:
Code:
perl -pe "s/(.*?<$2>){$3}(.*$content.*?)<\/$2>.*/\2/"

I can't use sed because it doesn't have non-greedy matching, I can't use grep because it doesn't have non-greedy matching without Perl-like extensions, and to my knowledge Bash cannot do something this complicated on its own.

Does anyone know of another way I can do this, so it's not "another language" we have to use to maintain with?

Thanks,
Zel2008
 

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Dumper(3)						User Contributed Perl Documentation						 Dumper(3)

NAME
XML::Dumper - Perl module for dumping Perl objects from/to XML SYNOPSIS
# Convert Perl code to XML use XML::Dumper; my $dump = new XML::Dumper; $data = [ { first => 'Jonathan', last => 'Eisenzopf', email => 'eisen@pobox.com' }, { first => 'Larry', last => 'Wall', email => 'larry@wall.org' } ]; $xml = $dump->pl2xml($perl); # Convert XML to Perl code use XML::Dumper; my $dump = new XML::Dumper; # some XML my $xml = <<XML; <perldata> <scalar>foo</scalar> </perldata> XML # load Perl data structure from dumped XML $data = $dump->xml2pl($Tree); DESCRIPTION
XML::Dumper dumps Perl data to a structured XML format. XML::Dumper can also read XML data that was previously dumped by the module and convert it back to Perl. This is done via the following 2 methods: XML::Dumper::pl2xml XML::Dumper::xml2pl AUTHOR
Jonathan Eisenzopf <eisen@pobox.com> CREDITS
Chris Thorman <ct@ignitiondesign.com> L.M.Orchard <deus_x@pobox.com> DeWitt Clinton <dewitt@eziba.com> SEE ALSO
perl(1), XML::Parser(3). perl v5.8.0 1999-06-20 Dumper(3)
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