javascript username validation

Question

What would be a good regex to use for validating a username, forbidding all special chars except the "@" symbol in case people want to use their email address as their username?

Just a reminder, you should also validate on the server-side, because a malicious user could bypass your Javascript validation. — muddybruin
– muddybruin, Commented Feb 15, 2011 at 1:02

Erik · Accepted Answer · 2011-02-15 01:01:03Z

2

^([a-zA-Z0-9.]+@){0,1}([a-zA-Z0-9.])+$

This will permit A-Z, a-z, 0-9 and ., and at most one @

answered Feb 15, 2011 at 1:01

Erik

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Community · Accepted Answer · 2021-10-07 06:09:01Z

2

Well I guess this may work for your circumstances (see below)...

var userRegex = /^[\w\.@]{6,100}$/;

This will match...

word characters such as 0-9, A-Z, a-z, _
literal period
literal @
between 6 and 100 characters long

You should probably look at the Email RFC, which states, amongst other characters, that the following are legal: ! # $ % & ' * + - / = ? ^ _ `` { | } ~. This means that the regex above will not allow all emails.

So...

var validUsername = document.getElementById('username').value.match(userRegex);

edited Oct 7, 2021 at 6:09

CommunityBot

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answered Feb 15, 2011 at 0:59

alex

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