Without punctuation and string delimiters, it's very difficult to know exactly what you're asking. The guidelines in "How do I post a question effectively?" will help you post a better question.

Regex substitution is performed with s///. You should probably read "perlrequick - Perl regular expressions quick start" and "perlretut - Perl regular expressions tutorial" to get a basic understanding of Perl's regular expressions before doing anything else.

It sounds like you probably want a lookup table and a regex using alternation. Here's a very simplistic example of the technique: 

#!/usr/bin/env perl -l

use strict;
use warnings;

my %lookup = ('500' => '000', '0 988' => '000', '0 1210' => '1000');
my $re = '(' . join('|' => keys %lookup) . ')';

my $string = 'www "999" xxx "0 1210" yyy "500" zzz "0 988"';
print $string;

$string =~ s/$re/$lookup{$1}/g;
print $string;

[download]

Output:

www "999" xxx "0 1210" yyy "500" zzz "0 988"
www "999" xxx "1000" yyy "000" zzz "000"

[download]

Depending on the context of the strings to be replaced, the pattern may need to be a lot more complex than that shown. For instance, given '500 988', do you want to replace 500' and ignore ' 988' or ignore '50' and replace '0 988'. Reading the documentation I linked to will help you understand these issues and how to deal with them. And, of course, assuming '0 988' is a string to be replaced is just a guess on my part (as I alluded to in the opening paragraph).

-- Ken

In reply to Re: String regex replacement by kcott
in thread String regex replacement by Anonymous Monk

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