commit https://github.com/vim/vim/commit/7b668e83d0635d082b7ec90d7d2aa30a9d7d8928 Author: Bram Moolenaar <Bram@vim.org> Date: Tue Aug 23 23:51:21 2016 +0200 patch 7.4.2244 Problem: Adding pattern to ":oldfiles" is not a generic solution. Solution: Add the ":filter /pat/ cmd" command modifier. Only works for some commands right now.

start:
test for empty string: ok
test for 1 char: ok
test for 3 chars: ok
test for contains meta char: ok
test for contains non-ascii char: ok