RegEx (?='\\').*$ - Trying to get username from domain\username

Question

I have a string like domainA\userNamePaul. I tried this regex (?='\\').*$ but the out put is same as input. I need to get the username without the domain. Any idea what I am doing wrong.

Answer 1

You need to use Positive lookbehind,

(?<=\\).*$

DEMO

Explanation:

(?<=                     look behind to see if there is:
  \\                       '\'
)                        end of look-behind
.*                       any character except \n (0 or more times)
$                        before an optional \n, and the end of the
                         string