> 1. What is the overhead on preg_replace?

Minimal. If you're looking for all the speed you can get, you'd
probably be better off with an str* function though if you can find
one. You'd have to be seriously after speed gains though.

> 2. Is there a better way to strip spaces and non alpha numerical
> characters from text strings? I suspect not...

Have a look through the string functions. the ctype_* functions too.
See if one fits your needs.

Richard Heyes

HTML5 Canvas graphing for Firefox, Chrome, Opera and Safari:
http://www.rgraph.net (Updated March 14th)

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