It looks cute, but it's wrong. About once every 10,000 times, rand() returns a number that's smaller than 0.0001, and that gets represented in scientific notation, meaning there are an 'e' and a '-' in the string. 
#!/usr/bin/perl

use strict;
use warnings;

my $c = 0;

while (1) {
    $c ++;
    my $r = rand;
    die "Failed ($r) after $c attempts.\n" if substr ($r, 2) =~ /\D/;
}
 
__END__
Failed (1.13079331747201195e-05) after 17507 attempts.

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Abigail

In reply to Re: Function over all letters in a string by Abigail-II
in thread Function over all letters in a string by Jobby

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