Help regarding behavior sed regexp query Post: 302372592

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Top Forums Shell Programming and Scripting Help regarding behavior sed regexp query Post 302372592 by sarbjit on Wednesday 18th of November 2009 09:56:05 AM

11-18-2009

Registered User

Help regarding behavior sed regexp query

Hi all,

I have one question regarding sed regexp (or any regexp in general),

I have some path like this

C:/Abc/def/ghi/jkl in a file file1

Now if i use following code

Code:

cat file1 | sed 's#\(.*\)/.*#\1#'

Now it give me following output
C:/Abc/def/ghi, which is fine

But i just want to know that in this sed code, why it is treating only last forward slash in file1 as the base for creating value of subsection (.*). i mean to say why it is treating C:/Abc/def/ghi as value of subsection. We are having 5 forward slashes in file1, why not it is picking upto C:/Abc/def.

Is that the property of regexp that if a sentence has five forward slashes & i use .*/.*, it will treat forward slash as last forward slash in file.

Can any one please suggest me some article/link to this question. I hope you are getting my question.

Thanks in advance

Sarbjit

Last edited by sarbjit; 11-18-2009 at 11:03 AM..

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LEARN ABOUT MOJAVE

ppi::token::regexp::match

PPI::Token::Regexp::Match(3)				User Contributed Perl Documentation			      PPI::Token::Regexp::Match(3)

NAME

       PPI::Token::Regexp::Match - A standard pattern match regex

INHERITANCE

	 PPI::Token::Regexp::Match
	 isa PPI::Token::Regexp
	     isa PPI::Token
		 isa PPI::Element

SYNOPSIS

	 $text =~ m/match regexp/;
	 $text =~ /match regexp/;

DESCRIPTION

       A "PPI::Token::Regexp::Match" object represents a single match regular expression. Just to be doubly clear, here are things that are and
       aren't considered a match regexp.

	 # Is a match regexp
	 /This is a match regexp/;
	 m/Old McDonald had a farm/eieio;

	 # These are NOT match regexp
	 qr/This is a regexp quote-like operator/;
	 s/This is a/replace regexp/;

METHODS

       There are no methods available for "PPI::Token::Regexp::Match" beyond those provided by the parent PPI::Token::Regexp, PPI::Token and
       PPI::Element classes.

       Got any ideas for methods? Submit a report to rt.cpan.org!

SUPPORT

       See the support section in the main module.

AUTHOR

       Adam Kennedy <adamk@cpan.org>

COPYRIGHT

       Copyright 2001 - 2011 Adam Kennedy.

       This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

       The full text of the license can be found in the LICENSE file included with this module.

perl v5.18.2							    2011-02-25					      PPI::Token::Regexp::Match(3)