SPUG: minimal unmatching regex
ssandv at gmail.com
Tue Aug 18 22:33:57 PDT 2009
well, /$^/ seems like a plausible starting point. Or ending point.
Or something. :-)
On Tue, Aug 18, 2009 at 12:04 PM, Michael R. Wolf<MichaelRWolf at att.net> wrote:
> What's the smallest (comprehensible) regex that's guaranteed to fail against
> all input?
> I'm creating a lab for perl classes. I want to provide the stub of a script
> that compiles, but always fails to match. Unfortunately, the obvious
> minimal RE of // matches *everything*.
> Here's a stub of the lab...
> # TODO... replace the following line with your regular expression to match
> zip codes.
> my $zip_re = qr//;
> like('98107', $zip_re, 'Simple 5-digit zip'),
> like('07748', $zip_re, 'Simple 5-digit zip with leading zero'),
> unlike('1234', $zip_re, 'Four digits');
> unlike('123456', $zip_re, 'Six digits');
> Michael R. Wolf
> All mammals learn by playing!
> MichaelRWolf at att.net
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