validating a username

Anon

hey all, this is a pretty simple one, i'm looking for a function that i could use to validate a username, the function should be able to make sure that the username conforms to email specs in case i ever wanted to add email functionality to my site. thanks.

Anon

Ehm..

So basically you need an email-adress-format verifier.
Search the forum and look in the TIPs section.

Anon

That's where I started, now I'm asking in here.

Anon

Dave

I've been having a look round. I get a lot of results on www.google.com by searching for 'email address validation'. Many of these are Javascript client-side routines, but you could either use them or translate them. If you add 'php' to the search string, then Google still comes up with pages of results, numbers of which are from phpbuilder's archives.

I also check out www.hotscripts.com occasionally which has quite a large php section. Found this snippet there, which uses a complex looking regular expression.

http://www.devhome.net/php/tips/4.html

Anon

Quite literally the first result I got when searching this site for "email verification":
http://www.phpbuilder.com/forum/archives/2/2000/9/2/107453

A function that does just about everything.

Anon

function is_email ($Address = "")
{

	if(!ereg("@",$Address))
	{
		return false;
	}

	list($User,$Host) = split("@",$Address);

	if ( (empty($User)) or (empty($Address)) )
	{
		return false;
	}
	if (!eregi("^[a-z0-9_\-\.]+@{1}[a-z0-9_\-]{1,64}(\.[a-z0-9_\-]{1,64})+$",$Address))
	    return FALSE;

	return true;
}

[deleted]

The eregi checks everything, you can leave out the rest.