commit https://github.com/vim/vim/commit/eaaa9bbda6ec0a8589a9b23720f95bffe01dc267 Author: Bram Moolenaar <Bram@vim.org> Date: Fri Dec 9 18:42:20 2016 +0100 patch 8.0.0125 Problem: Not enough testing for entering Ex commands. Solution: Add test for CTRL-\ e {expr}. (Dominique Pelle)

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