Test match range failure case with empty ranges returned

1 files changed, 5 insertions, 0 deletions

diff --git a/vespalib/src/tests/regex/regex.cpp b/vespalib/src/tests/regex/regex.cpp
index 28fb6bfffc3..1ab4a24a1b3 100644
--- a/vespalib/src/tests/regex/regex.cpp
+++ b/vespalib/src/tests/regex/regex.cpp
@@ -174,6 +174,11 @@ TEST("Can extract min/max prefix range from anchored regex") {
     min_max = Regex::from_pattern("^(hello|world)+").possible_anchored_match_prefix_range();
     EXPECT_EQUAL(min_max.first,  "hello");
     EXPECT_EQUAL(min_max.second, "worldwp");
+
+    // Bad regex; no range
+    min_max = Regex::from_pattern("*hello").possible_anchored_match_prefix_range();
+    EXPECT_EQUAL(min_max.first,  "");
+    EXPECT_EQUAL(min_max.second, "");
 }
 
 TEST_MAIN() { TEST_RUN_ALL(); }