Re: [FWP] japhy had a silly idea...

[merlyn@stonehenge.com (Randal L. Schwartz)]

>>>>> "Ilmari" == Ilmari Karonen <iltzu@sci.fi> writes:

Ilmari> On Fri, 25 May 2001, Jeff Pinyan wrote:
>> I tried for an hour and a half or so to craft a regex that matches itself,
>> and ONLY itself.
>> 
>> I came up with nothing -- well, several dead ends at least.

Ilmari> What are the constraints?  If embedding Perl code is allowed, I'd say
Ilmari> the problem essentially reduces to constructing a quine.

Ilmari> (No, I don't have the time to attempt a solution just now..)

Or even simpler:

$b = '\A$b\z';

The regex is /$b/.  It matches only '$b'. :)

-- 
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