Only check position if there is actually a match in MessageEvent starting_with
Only check position if there is actually a match in MessageEvent starting_with

Rubocop wanted me to use zero? but it's not completely equivalent - it doesn't work for non-numbers.

megumisonoda/discordrb,meew0/discordrb,meew0/discordrb,VxJasonxV/discordrb,megumisonoda/discordrb,VxJasonxV/discordrb,Roughsketch/discordrb,Roughsketch/discordrb