From a7061359b741b5716bddbefdc024f38405f758b0 Mon Sep 17 00:00:00 2001
From: Jan Edmund Lazo <jan.lazo@mail.utoronto.ca>
Date: Wed, 26 May 2021 00:21:09 -0400
Subject: vim-patch:8.2.2278: falling back to old regexp engine can some
 patterns

Problem:    Falling back to old regexp engine can some patterns.
Solution:   Do not fall back once [[:lower:]] or [[:upper:]] is used.
            (Christian Brabandt, closes vim/vim#7572)
https://github.com/vim/vim/commit/66c50c565321d4d49d8d5620912e5e8fe4825644
---
 src/nvim/testdir/test_regexp_utf8.vim | 46 +++++++++++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)

(limited to 'src/nvim/testdir')

diff --git a/src/nvim/testdir/test_regexp_utf8.vim b/src/nvim/testdir/test_regexp_utf8.vim
index 513780938e..d8d5797dcf 100644
--- a/src/nvim/testdir/test_regexp_utf8.vim
+++ b/src/nvim/testdir/test_regexp_utf8.vim
@@ -542,6 +542,52 @@ func Test_match_start_of_line_combining()
   bwipe!
 endfunc
 
+" Check that [[:upper:]] matches for automatic engine
+func Test_match_char_class_upper()
+  new
+  let _engine=&regexpengine
+
+  " Test 1: [[:upper:]]\{2,\}
+  set regexpengine=0
+  call setline(1, ['05. ПЕСНЯ О ГЕРОЯХ муз. А. Давиденко, М. Коваля и Б. Шехтера ...', '05. PJESNJA O GJEROJAKH mus. A. Davidjenko, M. Kovalja i B. Shjekhtjera ...'])
+  call cursor(1,1)
+  let search_cmd='norm /\<[[:upper:]]\{2,\}\>' .. "\<CR>"
+  exe search_cmd
+  call assert_equal(4, searchcount().total, 'TEST 1')
+  set regexpengine=1
+  exe search_cmd
+  call assert_equal(2, searchcount().total, 'TEST 1')
+  set regexpengine=2
+  exe search_cmd
+  call assert_equal(4, searchcount().total, 'TEST 1')
+
+  " Test 2: [[:upper:]].\+
+  let search_cmd='norm /\<[[:upper:]].\+\>' .. "\<CR>"
+  set regexpengine=0
+  exe search_cmd
+  call assert_equal(2, searchcount().total, 'TEST 2')
+  set regexpengine=1
+  exe search_cmd
+  call assert_equal(1, searchcount().total, 'TEST 2')
+  set regexpengine=2
+  exe search_cmd
+  call assert_equal(2, searchcount().total, 'TEST 2')
+
+  " Test 3: [[:lower:]]\+
+  let search_cmd='norm /\<[[:lower:]]\+\>' .. "\<CR>"
+  set regexpengine=0
+  exe search_cmd
+  call assert_equal(4, searchcount().total, 'TEST 3 lower')
+  set regexpengine=1
+  exe search_cmd
+  call assert_equal(2, searchcount().total, 'TEST 3 lower')
+  set regexpengine=2
+  exe search_cmd
+  call assert_equal(4, searchcount().total, 'TEST 3 lower')
 
+  " clean up
+  let &regexpengine=_engine
+  bwipe!
+endfunc
 
 " vim: shiftwidth=2 sts=2 expandtab
-- 
cgit