language agnostic - How do I prevent users from entering profanities? -

possible duplicate:
how implement profanity filter?

i have take city name users input, don't want accept profanities. can tell me how can keep users typing such words?

you'd have scan input vulgarity, either post-entry or during entry, , reject content then. inversoft (http://www.inversoft.com/) has web service available can help; can google search "java profanity filter" find other similar products.