diff --git a/development/autotests/findadv-19-in.txt b/development/autotests/findadv-19-in.txt
new file mode 100644
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+++ b/development/autotests/findadv-19-in.txt
@@ -0,0 +1,10 @@
+# Check that searching for regexp "([a-z]+)\s\1" finds duplicate words.
+
+Lang it_IT.utf8
+TestBegin test.lyx -dbg find > lyx-log.txt 2>&1
+KK: Hello world world!\C\[Home]
+KK: \Cs
+KK: \CF
+KK: \Axregexp-mode\[Return]([a-z]+)\\s\\1\[Return]
+TestEnd
+Assert pcregrep -M 'Putting selection at .*idx: 0 par: 0 pos: 6\n with len: 11' lyx-log.txt