How do you regex a part of a field name to use in a separate field?

[barney00]

I have a field which is a username, but the results of the username starts with "USR" and the actual username is "USRAjames".

I actually need to get the "A" and the "james" and put it in seperate field.

Thoughts?

[ddrillic]

A simplistic one ; - ) - USR(?<afield>A)(?<name>.*)

[Vijeta]

you can try this

rex field=username "USR(?<fname>\w{1})\w+"| rex field=username "USR\w{1}(?<lname>\w+)"