Revert "regexp: fix take-until to handle escapes at the end of a regexp."
Revert "regexp: fix take-until to handle escapes at the end of a regexp."

This reverts commit 2136abc1d64705805c5274337a799077f4b317e4.

bpollack/factor,bpollack/factor,tgunr/factor,bpollack/factor,tgunr/factor,mrjbq7/factor,bpollack/factor,mrjbq7/factor,mrjbq7/factor,AlexIljin/factor,factor/factor,bpollack/factor,tgunr/factor,tgunr/factor,AlexIljin/factor,mrjbq7/factor,AlexIljin/factor,AlexIljin/factor,AlexIljin/factor,AlexIljin/factor,factor/factor,factor/factor,bpollack/factor,tgunr/factor,tgunr/factor,factor/factor,mrjbq7/factor,AlexIljin/factor,bpollack/factor,factor/factor,mrjbq7/factor,factor/factor