fix unescaped special char in youtube prep regex
fix unescaped special char in youtube prep regex

JoshBoehm/reddit.theater,JoshBoehm/reddit.theater,UnaiYecora/Interdimensional-Cable,JoshBoehm/reddit.theater,reddit/reddit.tv,octatone/reddit.tv,xenithorb/reddit.tv,UnaiYecora/Interdimensional-Cable,xenithorb/reddit.tv,UnaiYecora/Interdimensional-Cable,octatone/reddit.tv,reddit/reddit.tv