It doesn't do what you are thinking. Not that I can figure out what you are thinking quite, but I'm quite sure it doesn't do it.

For a start rrv193\d{4}cm => "RNF191", is a syntax error. Possibly you want 'rrv193\d{4}cm' => "RNF191", which at least compiles, but my guess is that you are heading at the problem from the wrong direction. I suspect you are hoping that the hash key in some magical fashion will behave as a regular expression and will "match" any string provided as a "key" that it matches on. Sorry, it don't work that way.

So, what are you really trying to do. Not the solution you've come up with, but the bigger problem you are trying to solve?

My guess is you have a number of these matches and you want to provide a different replacement string for each one. So lets run with that idea for a moment. Consider:

use strict;
use warnings;

my %Ren2Dol = (
        'rrv193\d{4}cm' => "RNF191",
        'rrv194\d{4}cm' => "RNF196",
        'rrv195\d{4}cm' => "RNF200",
        );

while (<DATA>) {
    chomp;
    my ($base, $rest) = split /[\.\_]/, $_, 2;
    my ($match) = grep {$base =~ /$_/} keys %Ren2Dol;

    if (defined $match) {
        print "$Ren2Dol{$match}\n";
    } else {
        print "$base\n";
    }
}

__DATA__
rrv1931009cm.new090626
rrv1941009cm.new090626
rrv1951009cm.new090626
rrv1961009cm.new090626
rrv1931234cm.new090626

[download]

Prints:

RNF191
RNF196
RNF200
rrv1961009cm
RNF191

[download]
True laziness is hard work

In reply to Re: regular expression in a hash by GrandFather
in thread regular expression in a hash by lamasculo

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