diff --git a/src/testdir/test64.in b/src/testdir/test64.in
index 1ad33d9..8d0f535 100644
--- a/src/testdir/test64.in
+++ b/src/testdir/test64.in
@@ -250,6 +250,9 @@
 :call add(tl, [2, 'abc[0-9]*ddd', 'adf abc44482ddd oijs', 'abc44482ddd'])
 :call add(tl, [2, '\_[0-9]\+', 'asfi9888u', '9888'])
 :call add(tl, [2, '[0-9\n]\+', 'asfi9888u', '9888'])
+:call add(tl, [2, '\_[0-9]\+', "asfi\n9888u", "\n9888"])
+:call add(tl, [2, '\_f', "  \na ", "\n"])
+:call add(tl, [2, '\_f\+', "  \na ", "\na"])
 :"
 :"
 :"""" Test recognition of some character classes
diff --git a/src/testdir/test64.ok b/src/testdir/test64.ok
index 31052fb..40b02cd 100644
--- a/src/testdir/test64.ok
+++ b/src/testdir/test64.ok
@@ -576,6 +576,15 @@
 OK 0 - [0-9\n]\+
 OK 1 - [0-9\n]\+
 OK 2 - [0-9\n]\+
+OK 0 - \_[0-9]\+
+OK 1 - \_[0-9]\+
+OK 2 - \_[0-9]\+
+OK 0 - \_f
+OK 1 - \_f
+OK 2 - \_f
+OK 0 - \_f\+
+OK 1 - \_f\+
+OK 2 - \_f\+
 OK 0 - [0-9]
 OK 1 - [0-9]
 OK 2 - [0-9]