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Full Discussion: sed question
Top Forums Shell Programming and Scripting sed question Post 302075203 by Vikas Sood on Wednesday 31st of May 2006 02:09:17 PM
Old 05-31-2006
Example
Hi

I started the thread with the example. To make it clearer, below is the real life example :

I receive a file with a timestamp appended to it from source system. If it is a compressed file using gzip utility, source (a mainframe system) could send it in all the following possible formats:

filename.gz.timestamp
filename.GZ.timestamp
filename.Gz.timestamp
filename.gZ.timesstamp

I have to replace .gz., .Gz., .gZ., .GZ. to a single dot to make the above names as filename.timestamp. Once i am done with this, I will append a .gz suffix at the end. So at the end of this operation, i will have following gzip file

filename.timestamp.gz

I can now go ahead and unzip it. I was trying to use the following form of sed earlier using regular expression but it did not work for me..

echo $filename|sed 's/.gz.|.Gz.|.gZ.|.GZ././'

With what Vino suggested later on, i could resolve the issue but was just wondering why I could not use the above form of regular expression with sed.

Hope that makes it clearer.
 

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LEARN ABOUT DEBIAN

perl::critic::policy::regularexpressions::requirelineboundarymat

Perl::Critic::Policy::RegularExpressions::RequireLineBouUseryContributedPerl::Critic::Policy::RegularExpressions::RequireLineBoundaryMatching(3pm)

NAME

       Perl::Critic::Policy::RegularExpressions::RequireLineBoundaryMatching - Always use the "/m" modifier with regular expressions.

AFFILIATION

       This Policy is part of the core Perl::Critic distribution.

DESCRIPTION

       Folks coming from a "sed" or "awk" background tend to assume that '$' and '^' match the beginning and end of the line, rather than then
       beginning and end of the string.  Adding the '/m' flag to your regex makes it behave as most people expect it should.

	   my $match = m{ ^ $pattern $ }x;  #not ok
	   my $match = m{ ^ $pattern $ }xm; #ok

CONFIGURATION

       This Policy is not configurable except for the standard options.

NOTES

       For common regular expressions like e-mail addresses, phone numbers, dates, etc., have a look at the Regexp::Common module.  Also, be
       cautions about slapping modifier flags onto existing regular expressions, as they can drastically alter their meaning.  See
       <http://www.perlmonks.org/?node_id=484238> for an interesting discussion on the effects of blindly modifying regular expression flags.

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							    2012Perl::Critic::Policy::RegularExpressions::RequireLineBoundaryMatching(3pm)
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