Merge pull request #8881 from colega/single-literal-regexp-value-querier-testcase

Single literal regexp value test case for querier

tsdb/querier_test.go

@@ -1513,6 +1513,13 @@ func TestFindSetMatches(t *testing.T) {
 		pattern string
 		exp     []string
 	}{
+		// Single value, coming from a `bar=~"foo"` selector.
+		{
+			pattern: "^(?:foo)$",
+			exp: []string{
+				"foo",
+			},
+		},
 		// Simple sets.
 		{
 			pattern: "^(?:foo|bar|baz)$",