Re: Checking for a Valid Email String.

The original question was regarding email addresses, not usernames. If an ISP has a policy of requiring each left-hand-side of an email address to be a username, that ISP has a serious problem. On Wed, Mar 12, 2003 at 02:42:04PM +1300, Philip J. Newman wrote: > > how ever i don't think most ISPs let users pick names with the + sign in it > > > Don't forget plus signs. When providing email addresses to lists and > > web sites, I regularly tag my address (as the From address on this > > message demonstrates). Using procmail for local delivery allows these > > addresses to be delivered to my account, and I can more easily track > > down the origin of "tagged" spam. When I come across a web site or list > > that doesn't allow my address with a plus sign, I find another site or > > list. So I use: > > > > function isvalidemail($what) { > > if > (!eregi('[a-z0-9][a-z0-9._=+-]*@([a-z0-9][a-z0-9-]*\.)+[a-z][a-z]+$',$what)) > return(false); > > list($user,$domain) = explode("@",$what); > > if (!getmxrr($domain,$mxhosts)) return(false); > > if (!count($mxhosts) > 0) return(false); > > return(true); > > } -- Paul Chvostek <paul@it.ca> Operations / Abuse / Whatever it.canada, hosting and development http://www.it.ca/