W li¶cie z pi±, 28-05-2004, godz. 09:43 -0700, brogoff napisa³:

> Point taken. There's still a lot of "out of band" values that could be used to
> represent failure, such as substrings with negative indices.

I don't think this is a good idea, precisely because it's an "in band"
encoding. Match failure should be indicated either by None instead of
Some whatever, or by a predicate on the whole match object, or with an
exception - but not with a special substring.

-- 
   __("<         Marcin Kowalczyk
   \__/       qrczak@knm.org.pl
    ^^     http://qrnik.knm.org.pl/~qrczak/

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