parsing user supplied input

[Jason Novotny]

Hi,
   I'm wondering what libraries/classes exist that could help in 
parsing/cleaning user supplied input. For instance if I were to create a 
web based forum I need some utility that can convert/escape  any 
"dangerous" sequences. I don't want malicious users to post javascript 
that could result in cross-site scripting attacks, etc.

   Thanks, Jason

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