Special Character Filter Function Problem

[Krus1972]

I have the following function called within a large PHP script. All this function does, is it checks to see if any special character(s) have been submitted in a form. If a special character has been submitted, than an error message is sent to the user to fix their form entry. Right now, this script works find and it filters ALL special characters. I would like to allow the the period symbol to come through the from while continuing to block all other characters. Can someone help with this?

function check_domain($dname) {
global $errormsg, $text_17, $text_18, $text_19, $minlength, $maxlength, $reserved;
// Check if special chars are in there
	if(ereg("[^a-zA-Z0-9\-]",$dname)) { 
		$errormsg = "$text_19<br>";
	}
	return $errormsg;
}

Thanks for your time.

 

[ChrisHirst]

put it in the inverted character class you already have.

Chris.

Indifference will be the downfall of mankind, but who cares?
Time flies like an arrow, however, fruit flies like a banana.

Never mind this jesus character, stars had to die for me to live.

 

[Unscruffed]

Escape it the same way you did with the hyphen:

[^a-zA-Z0-9\-]

becomes

[^a-zA-Z0-9\-\.]

Another thing is that you don't need to escape the hyphen if you place it at the start:

[^-a-zA-Z0-9\.]

will work fine.

Heaven doesn't want me, and Hell's afraid I'll take over!