Al,
As promised, here is my inefficient code as written specifically for the Euler problem.
#!/usr/bin/perl
use strict;
use warnings;
use Math::BigFloat;
my ($max, $suspect) = (0,0);
N:
for (2..999) {
my $n = Math::BigFloat->new(1);
$n->bdiv($_, 4000);
my ($str) = $n->bstr() =~ /(\d+)\1/;
my ($best, $orig) = ('', $str);
while (1) {
my ($long_match) = $str =~ /(\d+)\1/;
last if ! defined $long_match;
next N if $long_match =~ /^(\d)\1+$/;
# ensure we don't reduce too far
my $len = length($long_match);
my $mult = int(length($orig) / $len);
last if substr($orig, 0, $len * $mult) !~ /^($long_match)+$/;
$str = $best = $long_match;
}
my $len = length($best);
($max, $suspect) = ($len, $_) if $len > $max;
}
print "$max\t$suspect\n";
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