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-tutorial/
for didactive examples.
On Nov 8, 2007 4:21 PM, Uwe Schmidt [EMAIL PROTECTED] 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
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