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    <p>This is quite a difficult problem to solve and you need determine if regular expressions will work for you and how you handle embedding (when you add a dictionary word to profanity like frackface except with the real F-word).</p> <p>Regular expressions generally have a limit to how long they can be and this usually prevents you from using a single regex for all your words. Executing multiple regular expressions against a string is really slow, depending on what performance you need and how big your blacklist gets. We initially implement <a href="http://www.inversoft.com/features/profanity-filter/" rel="nofollow">CleanSpeak</a> as a regular expression system, but it didn't scale and we rewrote it using a different mechanism.</p> <p>You also need to consider phrases, punctuation, spaces, leet-speak and other languages. All of these make regular expressions less appealing as a solution. Here are some examples using the word hello (assume it is profanity for this exercise):</p> <ul> <li>List item</li> <li>h e l l o</li> <li>h.e.l.l.o</li> <li>h_e_l_l_o</li> <li>|-|ello</li> <li>h3llo</li> <li>"hello there" (this phrase might not contain any profane words but combined they are profane)</li> </ul> <p>You also need to handle edge cases where two or more dictionary (whitelist) words contain a profanity when next to each other. Some examples that contain the s-word:</p> <ul> <li>bash it</li> <li>ssh it's quiet time</li> </ul> <p>These are obviously not profanity, but most homegrown and many commercial solutions have problems with these cases. </p> <p>We have spent the last 3 years perfecting the filter used by <a href="http://www.inversoft.com/features/profanity-filter/" rel="nofollow">CleanSpeak</a> to ensure it handles all of these cases and we continue to tweak it and make it better. We also spent 8 months perfecting our system for performance and it can handle about 5,000 messages per second. Not to say you can't build something usable, but be prepared to handle a lot of issues that might come up and also to create a system that doesn't use regular expressions.</p>
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    1. POProfanity Filter using a Regular Expression (list of 100 words)
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    1. USBrian Pontarelli
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