复制代码 代码如下:

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;

}