USER: @foo29 RE: /\@foo2\d/ USER: @zzz99 RE: /\@[a-z]{3}\d{2}/ USER: @AAA99 RE: /\@[a-zA-Z]\d{2}/ #Note that 'A' becomes #[a-zA-Z] rather than [a-z] with /i #because there may later be a 'z' #in your users pattern :)