Re: [Haskell-cafe] checking regular expressions

You don't need IO. Just need to use the (=~) operator (which can be confusing due to it's polymorphism). Take a look at http://www.serpentine.com/blog/2007/02/27/a-haskell-regular-expression-tutor... for didactive examples. On Nov 8, 2007 4:21 PM, Uwe Schmidt wrote:

Hi all,

what's the simplest way to check, whether a given string is a wellformed regular expression?

In the API there's just a "mkRegex" which does not make any checks, and the "matchRegex" which throws an exception when the regex isn't wellformed.

So do I need the IO monad for checking a regex?

Uwe _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe