You got me intrigued by the reference to your module.

Alas, what a disappointment!

Going through the list of "obscene" words we find such gems as:

• bastard (if one filters that, half of the genealogy of Europe's nobility will disappear)
• faggot (a bundle of sticks or twigs, esp. when bound together and used as fuel)
• bitch (a female dog)

Such a filter will never work; either it leaves too many "obscene" words in or it filters out too much. A regex is not bright enough to consider the context.