1 files changed, 19 insertions, 0 deletions
diff --git a/jstests/core/query/regex/regexa.js b/jstests/core/query/regex/regexa.js
new file mode 100644
index 00000000000..694436e87a8
--- /dev/null
+++ b/jstests/core/query/regex/regexa.js
@@ -0,0 +1,19 @@
+// Test simple regex optimization with a regex | (bar) present - SERVER-3298
+
+t = db.jstests_regexa;
+t.drop();
+
+function check() {
+    assert.eq(1, t.count({a: /^(z|.)/}));
+    assert.eq(1, t.count({a: /^z|./}));
+    assert.eq(0, t.count({a: /^z(z|.)/}));
+    assert.eq(1, t.count({a: /^zz|./}));
+}
+
+t.save({a: 'a'});
+
+check();
+t.createIndex({a: 1});
+if (1) {  // SERVER-3298
+    check();
+}