菜鸟教程在线编辑器

AI 编程工具

 
                <!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>菜鸟教程(runoob.com)</title>
</head>
<body>

<script>
var str = "abc123def";
var str2 = "abc123_def";
var patt = /[a-zA-Z0-9_]+/;
document.write(str.match(patt));
document.write('<br/>');
document.write(str2.match(patt));
</script>

</body>
</html>
              