Regexp tip Post: 302456193

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Top Forums Shell Programming and Scripting Regexp tip Post 302456193 by Corona688 on Thursday 23rd of September 2010 12:17:36 PM

09-23-2010

Registered User

I'm not sure what you're trying to do with \s. Is that Perl syntax? It's not in POSIX regular expressions.

Remember that the 's/this/that/' syntax replaces the text it matches. It doesn't put any bit of 'this' back into 'that'. If you have GNU sed, and enable backreferences with the -r flag, you can put brackets around parts you want to match and substitute them in the output string with \1, \2, etc.

That won't help you translate 'a' to '1', though. (I'm not sure from where you're pulling these numbers, either.) The replacements you want are complex: Split a line into elements, for each element match something, read it in, translate it to a number, insert in front... A language like awk would probably be more appropriate than a regex tool like sed.

---------- Post updated at 10:17 AM ---------- Previous update was at 10:06 AM ----------

Think I see better what you're trying to do. sed can do part of it.

Code:

$ echo a s d f | sed -r 's/[ ]+/ \& /g'
a & s & d & f
$

[ ]+: match one or more spaces
\& : replace with space, ampersand, space
g: match multiple times per line if possible

You need the -r flag to match "one or more" with + like that. It could be GNU sed only.

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ppix::regexp::token

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

NAME

       PPIx::Regexp::Token - Base class for PPIx::Regexp tokens.

SYNOPSIS

	use PPIx::Regexp::Dumper;
	PPIx::Regexp::Dumper->new( 'qr{foo}' )->print();

INHERITANCE

       "PPIx::Regexp::Token" is a PPIx::Regexp::Element.

       "PPIx::Regexp::Token" is the parent of PPIx::Regexp::Token::Assertion, PPIx::Regexp::Token::Backtrack, PPIx::Regexp::Token::CharClass,
       PPIx::Regexp::Token::Code, PPIx::Regexp::Token::Comment, PPIx::Regexp::Token::Control, PPIx::Regexp::Token::Greediness,
       PPIx::Regexp::Token::GroupType, PPIx::Regexp::Token::Literal, PPIx::Regexp::Token::Modifier, PPIx::Regexp::Token::Operator,
       PPIx::Regexp::Token::Quantifier, PPIx::Regexp::Token::Reference, PPIx::Regexp::Token::Structure, PPIx::Regexp::Token::Unknown,
       PPIx::Regexp::Token::Unmatched and PPIx::Regexp::Token::Whitespace.

DESCRIPTION

       This class represents the base of the class hierarchy for tokens in the PPIx::Regexp package.

METHODS

       This class provides no public methods beyond those provided by its superclass.

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) 2009-2013 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 v5.16.3							    2014-06-10						    PPIx::Regexp::Token(3)