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;
}