Hey everyone, I'm hoping someone can point me in the right direction. The regex-pcre package exports (=~) and (=~~) as two useful infix functions. They're great! The only problem is, they are a *positive* match for a regex. I have a file that contains HTML comments (it was generated in Word) and I really just want the barest text. I already have a function that strips out all the tags, and I have a function that finds all the links and sticks those in another file for later perusal.
What I'd like is advice on how to implement the (!~) and (!~~) operators. They should have the same types as (=~) and (=~~). I'm stuck, though. Here's the source for both of those functions: they depend on Text.Rege.PCRE package. (=~) :: (RegexMaker<http://hackage.haskell.org/packages/archive/regex-base/0.93.2/doc/html/Text-Regex-Base-RegexLike.html#t:RegexMaker> Regex<http://hackage.haskell.org/packages/archive/regex-pcre/0.94.2/doc/html/Text-Regex-PCRE-Wrap.html#t:Regex> CompOption<http://hackage.haskell.org/packages/archive/regex-pcre/0.94.2/doc/html/Text-Regex-PCRE-Wrap.html#t:CompOption> ExecOption<http://hackage.haskell.org/packages/archive/regex-pcre/0.94.2/doc/html/Text-Regex-PCRE-Wrap.html#t:ExecOption> source, RegexContext<http://hackage.haskell.org/packages/archive/regex-base/0.93.2/doc/html/Text-Regex-Base-RegexLike.html#t:RegexContext> Regex<http://hackage.haskell.org/packages/archive/regex-pcre/0.94.2/doc/html/Text-Regex-PCRE-Wrap.html#t:Regex> source1 target) => source1 -> source -> target (=~) x r = let q :: Regex q = makeRegex r in match q x (=~~) :: (RegexMaker<http://hackage.haskell.org/packages/archive/regex-base/0.93.2/doc/html/Text-Regex-Base-RegexLike.html#t:RegexMaker> Regex<http://hackage.haskell.org/packages/archive/regex-pcre/0.94.2/doc/html/Text-Regex-PCRE-Wrap.html#t:Regex> CompOption<http://hackage.haskell.org/packages/archive/regex-pcre/0.94.2/doc/html/Text-Regex-PCRE-Wrap.html#t:CompOption> ExecOption<http://hackage.haskell.org/packages/archive/regex-pcre/0.94.2/doc/html/Text-Regex-PCRE-Wrap.html#t:ExecOption> source, RegexContext<http://hackage.haskell.org/packages/archive/regex-base/0.93.2/doc/html/Text-Regex-Base-RegexLike.html#t:RegexContext> Regex<http://hackage.haskell.org/packages/archive/regex-pcre/0.94.2/doc/html/Text-Regex-PCRE-Wrap.html#t:Regex> source1 target, Monad<http://hackage.haskell.org/packages/archive/base/4.5.0.0/doc/html/Control-Monad.html#t:Monad> m) => source1 -> source -> m target (=~~) x r = do (q :: Regex) <- makeRegexM r matchM q x What I figured I could do was find a function that was the inverse of "match" and "matchM", but I can't find any in the docs. I really hope I don't have to implement *that*, too. I'm still new at this, and that seems like it would be over my head.
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