[Haskell] Ignoring input

[UnfitElf]

Hi everyone,

Im new to haskell and finding it quite hard to pickup as im a C/C++
programmer however, im sticking with it as i think its a good thing to know.

I have a problem were i have the user input a string, i then want to
disregard the punctuation marks and spaces and change the case of the string
to lower case.

I was thinking that with the case i could work out the difference of the
capital 'A' and the small 'a' and then change them somehow? As for ignoring
punctuation marks and spaces im clueless.

Thanks for any help
Daniel
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