I wanted to be able to tell some tool what regexes to use in munging filenames into new filenames. I'm sure there are tools like this out there, but, nevertheless, I wrote yet another version of it. Not wanting to eval STR a bazillion times when I didn't have to, I prematurely optimised that with a single eval STR that creates a code ref instead (which is really the cool part of this CUFP to me). 

#!/usr/bin/perl

use strict;
use warnings;

my $f = shift;

if ($f =~ m[^s/])
{
    $f = eval "sub { $f }";
}
else
{
    my $re = qr/$f/;
    my $to = shift;

    $f = eval "sub { s/\$re/$to/ }";
}

for (@ARGV)
{
    my $o = $_;
    $f->();
    if ($o ne $_)
    {
        print "rename $o, $_\n";
        rename $o, $_;
    }
}

[download]
I save this as "myrn" and then I can just run "myrn '(\d\d)-(\d\d)-(\d{4})' '$3-$2-$1' [0-9]*.doc" to fix the YMD naming of your doc files.

Update: I just knew this was another rename tool... thanks, repellent ;-) (though this is quite specialised and easier to use, abuse, and misuse...)

In reply to Yet another perl-rename tool by Tanktalus

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