CODEWITHSUNDEEP
javaregex
root
root

Reputation: 23

Regex for Username not working

Here is my regex for validating a username:

^([a-zA-Z0-9]+([\\s.]?[a-zA-Z0-9]+)*){6,20}$

The username should be between 6-20 characters, with space or period(.) followed by a word or character.

But this regex fails for the following examples, even though the entire string length(including space is at least 6 characters):

  1. joe jim
  2. adam rick

Any help will be appreciated!

Upvotes: 0

Views: 114

Answers (2)

fabio
fabio

Reputation: 119

You can match your user with this.

^([a-zA-Z0-9\s\.]){6,20}$

This will probably match more than just your login. Because this will match multiple blank spaces or periode. You can use an other regex to mach that you login has just one periode or blank space.

^[a-zA-Z0-9]+[\s\.]?[a-zA-Z0-9]+$

Hope it helps.

Upvotes: 0

Jerry
Jerry

Reputation: 71538

You could use a positive lookahead to make sure there's between 6 to 20 characters inclusive:

^(?=.{6,20}$)[a-zA-Z0-9]+([\\s.][a-zA-Z0-9]+)*$
 ^----------^

And you shouldn't really need the ? for the space/period here.

Upvotes: 1

Related Questions