Preg function to search for email addy or URL

[phantomcougar]

Anyone know a good preg function or any other function what would search a string and return a true/false depending on if it found an URL or email address in that string?

Basically I am trying to cut down on spam so I want to make sure users who post on my message board system don't try to post URLs or email addresses in their posts.

Obviously I could search for such key strings as [url]http://[/url] or any word that contains the "@" symbol and .com or .net.... etc etc etc , but I am not sure how to write the preg for it.....

Thanks.

[matt_4013]

for the url

preg_match("/http:\/\/[a-z0-9\-]+(.[a-z]{2,5})*/si", $string);

for the email

preg_match("/[a-z0-9\-]+(.[a-z0-9\-]+)@[a-z0-9\-]+(.[a-z0-9\-]+)/si", $string);