Admitting I'm still learning regular expressions, can anybody help me understand what email chars I'll be allowing through with this string?

^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*$'

Or even better, point me to a useful expression validator.

Thanks!

    From: http://iamcal.com/publish/articles/php/parsing_email/:

    function is_valid_email_address($email) {
   $qtext = '[^\\x0d\\x22\\x5c\\xa6-\\xff]';
   $dtext = '[^\\x0d\\x5b-\\x5d\\xa6-\\xff]';
   $atom = '[^\\x00-\\x20\\x22\\x28\\x29\\x2c\\x2e\\x3a-\\x3c'.
   '\\x3e\\x40\\x5b-\\x5d\\xa6-\\xff]+';
   $quoted_pair = '\\x5c[\\x00-\\xa5]';
   $domain_literal = "\\x5b($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));
}

      Here you are 🙂

      function check($address)
{
  // check an email address is possibly valid
  if (ereg('^[a-zA-Z0-9_\.\-]+@[a-zA-Z0-9\-]+\.[a-zA-Z0-9\-\.]+$', $address))
{
   echo ("Valid email address");
}
  else 
{
    echo ("Invalid email address");
}?
}
        HoangLong wrote:

        Here you are 🙂

        function check($address)
{
  // check an email address is possibly valid
  if (ereg('^[a-zA-Z0-9_\.\-]+@[a-zA-Z0-9\-]+\.[a-zA-Z0-9\-\.]+$', $address))
{
   echo ("Valid email address");
}
  else 
{
    echo ("Invalid email address");
}?
}

        That will give a false positive for an address such as "name@domain.-.".

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