Trying to make a url generator from a title

Hi there,

I have been trying to make a generator that will take a title and strip out all the special characters like !"£$ etc...

I have used strtolower and str_replace in a chain with each character but it is inconsistent and will not strip everything like ~.

Is there anything out there that can help with something like this,  I have had a bit of a search but nothing had turned up yet.

Thanks,

Doomie