Hi,

I read you initial question again and again and I don't understand your answer. Probably to clarify here a little more code:

use strict;
use warnings;
use 5.010;

my @filenames =('XYZ12345_X05_20110805_9999999.TXT', 'XYZ12345_X05_201
+10805_9999999_00001.TXT');
for my $filename (@filenames) {
    my $rd = int( rand(100000)) + 999999;
    say "unchanged_filename: $filename";
    $filename =~ s/_00001\./_$rd./;
    say "changed_filename: $filename";
}

[download]

So, what are my assumptions: You do only have one '.' in your filename seperating the extention 'TXT' from the part you called filename. With this assumption there is exactly one "reference" point in the regex and that is the point separating the extention. That means, if and only if a substring of the format _00001 preceeds the point, therefor is at the end of your "filename" I do a substitution of that part with a random number you provided in your example.

Have I understood your problem totally wrong?

Best regards
McA

In reply to Re^3: Filename change with regular expression by McA
in thread Filename change with regular expression by Anonymous Monk

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