<?php
$email='1909970983@.qq.com';
$pattern="/([a-z0-9]*[-_.]?[a-z0-9]+)*@([a-z0-9]*[-_]?[a-z0-9]+)+[.][a-z]{2,3}([.][a-z]{2})?/i";
if(preg_match($pattern,$email)){
    echo '邮箱验证通过！';
} else{
    echo '邮箱格式错误！';
}
?>