vim-patch:7.4.2355

Problem:    Regexp fails to match when using "\>\)\?". (Ramel)
Solution:   When a state is already in the list, but addstate_here() is used
            and the existing state comes later, add the new state anyway.

16b3578f35

src/nvim/testdir/test_regexp_utf8.vim

@@ -97,3 +97,12 @@ func Test_recursive_substitute()
   call setwinvar(1, 'myvar', 1)
   bwipe!
 endfunc
+
+func Test_eow_with_optional()
+  let expected = ['abc def', 'abc', 'def', '', '', '', '', '', '', '']
+  for re in range(0, 2)
+    exe 'set re=' . re
+    let actual = matchlist('abc def', '\(abc\>\)\?\s*\(def\)')
+    call assert_equal(expected, actual)
+  endfor
+endfunc