ediff-focus-on-regexp-matches

ediff-focus-on-regexp-matches is a compiled Lisp function in `ediff-util.el'.

(ediff-focus-on-regexp-matches N)

Focus on diffs that match regexp `ediff-regexp-focus-A/B'.
Regions to be ignored according to this function are those where
buf A region doesn't match `ediff-regexp-focus-A' and buf B region
doesn't match `ediff-regexp-focus-B'.
This function returns nil if the region number N (specified as
an argument) is not to be ignored and t if region N is to be ignored.

N is a region number used by Ediff internally. It is 1 less
the number seen by the user.