unhighlight-regexp

unhighlight-regexp is an alias for `hi-lock-unface-buffer' in `hi-lock.el'.

It is bound to M-s h u.

(unhighlight-regexp REGEXP)

Remove highlighting of each match to REGEXP set by hi-lock.
Interactively, prompt for REGEXP, accepting only regexps
previously inserted by hi-lock interactive functions.
If REGEXP is t (or if C-u was specified interactively),
then remove all hi-lock highlighting.