25 chars.

I wasn't going to post this since it uses a module but I guess that someone should. 

sub base36 {
    #23456789_123456789_12345 (25)
    use POSIX;0+strtol+pop,36
}

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--
John.

In reply to Re: The Perl Review by jmcnamara
in thread The Perl Review by Kit

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