<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>匹配域名</title>
<style type="text/css">
</style>
</head>
<body>
<script type="text/javascript">
var str="https://www.baidu.com/s?cl=3";
var reg=/https:\/\/([A-Za-z\.]+)\/\S+/;
var result=reg.exec(str);
if(result) {
console.log(result[1]);
}
</script>
</body>
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