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showing results for - "regex for username"
Carl
07 Apr 2016
1^(?=[a-zA-Z0-9._]{8,20}$)(?!.*[_.]{2})[^_.].*[^_.]$
2
source
Emmy
23 Feb 2019
1let username = '';
2username = username.replace(/\s/g,'_');
3username = username.replace(/\-/g,'.');
4username = username.match(/[a-zA-Z0-9\.\s]+/g).join('_');
source
Laura
29 Aug 2019
1# works in most newer browsers
2^(?=.{8,20}$)(?![_.])(?!.*[_.]{2})[a-zA-Z0-9._]+(?<![_.])$
3 └─────┬────┘└───┬──┘└─────┬─────┘└─────┬─────┘ └───┬───┘
4       │         │         │            │           no _ or . at the end
5       │         │         │            │
6       │         │         │            allowed characters
7       │         │         │
8       │         │         no __ or _. or ._ or .. inside
9       │         │
10       │         no _ or . at the beginning
11       │
12       username is 8-20 characters long
13
14# works in all browsers, but does the same as the above RegEx
15^(?=[a-zA-Z0-9._]{8,20}$)(?!.*[_.]{2})[^_.].*[^_.]$
Vanessa
06 Feb 2020
1<html>
2<head>
3	<title></title>
4</head>
5<body>
6<form method="post" action="">
7	username:<input type="text"  id="name" onkeyup="validation()">
8	</form>
9</body>
10<script type="text/javascript">
11	function validation(){
12	var username=document.getElementById("name").value;///get id with value 
13	var usernamepattern=/^[A-Za-z .]{3,15}$/;////Regular expression
14	if(usernamepattern.test(username))
15	{
16		document.getElementById("name").style.backgroundColor='yellow';
17    }
18    else
19    {
20    	document.getElementById("name").style.backgroundColor='red'; }
21	}
22
23</script>
24</html>
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