regular expressions and Phone validation

["Paul Goepfert" <paul.goepfert@xxxxxxxxx>]

Hi all,

I have one small problem I don't understand the preg_replace() method.
 I understand the gist of what it does but I still don't fully know
what it does.  I have read the entry in the php manual about this and
I am still confused about it. I've never been any good with regular
expressions.

Here is the function in use:

function checkPhone ($Phone)
{
        global $errmsg;
                if (!empty($Phone))
		{
			$Phone = ereg_replace("[^0-9]", '', $Phone);
			
			if ((strlen($Phone)) <= 14)
				return preg_replace("/[^0-9]*([0-9]{3})[^0-9]*([0-9]{3})[^0-9]*([0-9]{4}).*/",
"(\\1) \\2-\\3",$Phone);
		}
}

I think my problem is mostly what is returned when preg_replace executes?

Paul

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