fix deprecation warning about unescaped left brace in regex
fix deprecation warning about unescaped left brace in regex

njtaylor/get-flash-videos,monsieurvideo/get-flash-videos,monsieurvideo/get-flash-videos,njtaylor/get-flash-videos,pcwalden/get-flash-videos,njtaylor/get-flash-videos,pcwalden/get-flash-videos,pcwalden/get-flash-videos,monsieurvideo/get-flash-videos