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Full Discussion: Use sed on column (csv) file if data in colmns is greater > than?
Top Forums UNIX for Dummies Questions & Answers Use sed on column (csv) file if data in colmns is greater > than? Post 302717095 by bakunin on Wednesday 17th of October 2012 02:14:04 PM
Old 10-17-2012
Quote:
Originally Posted by Chris Eagleson
Code:
sed '/^[^,]*,[^,]*,[^,]*,[^,]*,[^,]*,[^,]*,[^,]*,[^,]*,[^,]*,[^,]*,[^,]*,[^,]*,[^,]*,[^,]*,/d' infile
         1     2     3     4     5     6     7    8      9     10    11    12    13   14

Almost. ;-))

You can "multiply" regexp parts with the "\{...\}" operator. For instance: "x" means a single "x", but "x\{3\}" means "three x" and would be equivalent to "xxx". But it comes even better, the operator can be given two values, which will define a range: "x\{1,3\}" means "one, two or three x". Instead of "x" one could even put a complicated regexp in braces.

Now your problem: a single field in a comma-separated file would be matched by: "[^,]*,". You have already figured that out. Now we try to match something in the 11th field. This is: ten fields, followed by the field on question:

Code:
/^\([^,]*,\)\{10\}xxx/

This matches "xxx" in the eleventh field. You see you could shorten and simplify your regexp considerably using this device. Your search for "more than 999.9 in the 10th, 11th or 12th field" could look like this:

Code:
/^\([^,]*,\)\{9,11\}[0-9][0-9][0-9][0-9]/

9-11 fields, followed by a number of at least 4 digits.

I hope this helps.

bakunin
 

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LEARN ABOUT OSX

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 v5.16.2							    2011-02-25					      PPI::Token::Regexp::Match(3)
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