Sanitize sentence in php

Question

The title may sound odd, but im kind of trying to set up this preg_replace that takes care of messy writers for a textarea. It has to:

1. if there is an exclamation s

Answer 1

I might have to use this for my own sites... nice idea!

And the 'modified' version of $text: "My house, which is green, is nice! And pretty too."

UPDATE: Here's the version that handles "abc,def" -> "abc, def".

I would think this is a bit slower since it's an additional function call.