patch 8.1.0935: old regexp engine may use invalid buffer commit https://github.com/vim/vim/commit/8bfd9469cef536f171e6666f9d9217192e09d161 Author: Bram Moolenaar <Bram@vim.org> Date: Sat Feb 16 18:07:57 2019 +0100 patch 8.1.0935: old regexp engine may use invalid buffer Problem: Old regexp engine may use invalid buffer for 'iskeyword' or uninitialized buffer pointer. (Kuang-che Wu) Solution: Set rex.reg_buf when compiling the pattern. (closes #3972)