phone number validation

hi
help me on this...

$pn is phone number
the format is country+space+city+space+phonenumber+(ext)+ number
example
1 800 4545456454 (w|w/0) ext 45454

Is my code correct?

if (!eregi("^[0-9]+[[:space:]]+[0-9]+[[:space:]]+[0-9]+([[:space:]].ext[[:space:]]+[0-9]+)$",$pn))
return 0;
else
return 1;

--> 45645645646 == correct
--> 1 800 4545454545 == incorrect...

It didnt work well
Can anyone tell me whats wrong?

try these:

preg_match("/\d{3}\w?\d{3}\w?\d{4}\w?(\wext\w\d+/i", $pn) ? return true : return false;

this will check for : xxx xxx xxxx [ext xxx..] , ext optional
if you want to allow xxx-xxx-xxxx, use this one:

preg_match("/\d{3}(\w|-)?\d{3}(\w|-)?\d{4}\(w|-)?(\wext\w\d+/i", $pn) ? return true : return false;

thx