正則表達式2 定義規則

時間 2021-01-13

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title></title>
</head>
<body>

</body>
<script>
    var name='1a12345asdf';
    var errname='110qertyu'  var namec=/^[a-zA-Z][a-zA-Z0-9]{3,15}$/
    var pwdc=/^[a-zA-Z0-9]{4,10}$/
    var btdc=/^(19\d{2}|200\d)-(0?[1-9]|1[0-2])-((0?[1-9]|[1-2]\d)|3[0-1])$/
    alert(namec.test(name));
    alert(namec.test(errname));
</script>
</html>