Fix check that user_id is alphanumeric

generate.sh

@@ -62,7 +62,7 @@ parse_params() {
   [[ -z "${context-}" ]] && die "Missing required parameter: context"
   [[ -z "${user-}" ]] && die "Missing required parameter: user"
   [[ "${context-}" =~ ^[[:alnum:]]+$ ]] || die "context must be alphanumeric only"
-  [[ "${user-}" =~ ^[[:alnum:]]]+$ ]] || die "user must be alphanumeric only"
+  [[ "${user-}" =~ ^[[:alnum:]]+$ ]] || die "user must be alphanumeric only"
   [[ ${#args[@]} -eq 0 ]] && die "No command specified"
 
   return 0