edirs3

edirs3 is an alias for `ediff-directories3' in `ediff.el'.


(edirs3 DIR1 DIR2 DIR3 REGEXP)

Run Ediff on three directories, DIR1, DIR2, and DIR3, comparing files that
have the same name in all three. The last argument, REGEXP, is nil or a
regular expression; only file names that match the regexp are considered.