package Ġdev . as pid 8 1 2 . soft mach demo . exception Ċ Ċ class ĠInvalid Username Exception ( Ċ ĉ username : ĠString Ċ ) Ġ: ĠSoft M ach ina Demo Exception (" Username Ġ'$ username ' Ġdoes Ġnot Ġmeet Ġthe Ġpattern ") Ċ