xxxxxxxxxx
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>菜鸟教程(runoob.com)</title>
</head>
<body>
<script>
var str="Is this all there is";
var patt1=/is(?= all)/;
document.write(str.match(patt1));
</script>
</body>
</html>
AI 编程工具