username validation in javascript

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Matteo
21 Aug 2019
1function validateUserName(username){
2  var usernameRegex = /^[a-zA-Z0-9]+$/;
3  return usernameRegex.test(username);
4}
Kiki
12 Oct 2017
1<!DOCTYPE html>
2<html>
3<head>
4	<title></title>
5</head>
6<body>
7<form method="post" action="">
8	username:<input type="text"  id="name" onkeyup="validation()">
9	</form>
10</body>
11<script type="text/javascript">
12	function validation(){
13	var username=document.getElementById("name").value;///get id with value 
14	var usernamepattern=/^[A-Za-z .]{3,15}$/;////Regular expression
15	if(usernamepattern.test(username))
16	{
17		document.getElementById("name").style.backgroundColor='yellow';
18    }
19    else
20    {
21    	document.getElementById("name").style.backgroundColor='red'; }
22	}
23
24</script>
25</html>
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