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<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<script type="text/javascript">
var str="2018hulianwangg5_1" // 题目：在这段字符串中提取出【'2018','5','1'】
</script>
</body>
</html>
var str="2018hulianwangg5_1";
console.log(str.match(/\d+/g))