XF 2.1 Regex Query

[David Hallam]

Hi all,

Newbie here

I have a custom field added onto the user registration.

I need to ensure they add only a Surname, followed by a comma, a space - then another name, and another - upto 100 characters all on one line

Example = Hallam, Wilson, Harris, Crowder, Lane, Crisp, Naylor, Downs

/^[a-z0-9\s]+$/

Any help required please
Thanks