1 files changed, 19 insertions, 0 deletions
diff --git a/jstests/core/regexa.js b/jstests/core/regexa.js
new file mode 100644
index 00000000000..b0d47190e77
--- /dev/null
+++ b/jstests/core/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.ensureIndex( {a:1} );
+if ( 1 ) { // SERVER-3298
+check();
+}