[Haskell-cafe] Re: ANN: weighted-regexp-

Martijn van Steenbergen martijn at van.steenbergen.nl
Wed Jul 28 11:20:45 EDT 2010

On 7/27/10 9:58, Sebastian Fischer wrote:
> On Jul 27, 2010, at 9:15 AM, Sjoerd Visscher wrote:
>> Oh, by the way, with noMatch, eps, alt and seq_ RegExp is itself a
>> Semiring,
> Yes, but it's hard to define an Eq instance for arbitrary regular
> expressions that reflects equivalence of regexps.

How hard is this exactly?


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