vim: Revert to default regexp engine

Let's see if this is better in Vim 8.2.

vim: Revert to default regexp engine
Let's see if this is better in Vim 8.2.
3c88b7c9 · James T. Lee · 1042df79 · 3c88b7c9
Commit 3c88b7c9 authored Aug 02, 2021 by James T. Lee
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--- a/.vimrc
+++ b/.vimrc
@@ -153,9 +153,3 @@ augroup special_filetypes
    " http://vim.wikia.com/wiki/Always_start_on_first_line_of_git_commit_message
    autocmd FileType gitcommit autocmd! BufEnter COMMIT_EDITMSG call setpos('.', [0, 1, 1, 0])
 augroup end
-
-" XXX: Work around painfully slow syntax highlighting for ruby/perl/others:
-" use the legacy regexp engine.  Bug reports suggest this problem is specific
-" to 'relativenumber' configurations, but the slowness arises with 'hlsearch'
-" too.
-set regexpengine=1