email validation help

[jl9148]

i have a registration form taht requires a valid email.
it works and everything is fine, but sometimes people would have emails like this ==> [e-mail] or [e-mail]

or something like that

my code is

if ( !eregi('^[a-zA-Z0-9._-]+@[a-zA-Z0-9-]+\.[a-zA-Z.]{2,5}$', $email_address ) ) {
$errors[] = "The email address you provided must be valid!";
}

it only works when users have a simple address like [e-mail]

how do i make it so it can accept all kinds of email?

[NogDog]

This is the function I use, taken from http://iamcal.com/publish/articles/php/parsing_email/ :

# email address validation function
# kudos to http://iamcal.com/publish/articles/php/parsing_email/
function is_valid_email_address($email) {
  $qtext = '[^\\x0d\\x22\\x5c\\x80-\\xff]';
  $dtext = '[^\\x0d\\x5b-\\x5d\\x80-\\xff]';
  $atom = '[^\\x00-\\x20\\x22\\x28\\x29\\x2c\\x2e\\x3a-\\x3c'.
  '\\x3e\\x40\\x5b-\\x5d\\x7f-\\xff]+';
  $quoted_pair = '\\x5c\\x00-\\x7f';
  $domain_literal = "\\x5b($dtext|$quoted_pair)*\\x5d";
  $quoted_string = "\\x22($qtext|$quoted_pair)*\\x22";
  $domain_ref = $atom;
  $sub_domain = "($domain_ref|$domain_literal)";
  $word = "($atom|$quoted_string)";
  $domain = "$sub_domain(\\x2e$sub_domain)*";
  $local_part = "$word(\\x2e$word)*";
  $addr_spec = "$local_part\\x40$domain";
  return preg_match("!^$addr_spec$!", $email) ? 1 : 0;
}