i have used the following code to validate the username it is working fine
=============================================
if( $username == "" || !preg_match("/^[a-z0-9]+(?:_[a-z0-9]+)?$/i",
$username) )
{
$error.="User name cannot be blank or has special characters";
}
=============================================
it does not accept UNDERSCORE at the beginning or end however while i
was testing with different special characters except for # the
validation works fine for all other special characters.
for example if i enter the user name as = abc#123
in this case # sign and what comes after # sign is being ignored. so
in this case the username is being read as abc ONLY and not abc#123
this is very strange, how can i still validate # sign and tell the
user that # sign is not a valid username like i have been doing with
any other special characters like = !@$...........
please advice.
thanks.
