1 files changed, 26 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/basic/regexpLastIndexReset.js b/js/src/jit-test/tests/basic/regexpLastIndexReset.js
new file mode 100644
index 0000000000..dbe3c3b763
--- /dev/null
+++ b/js/src/jit-test/tests/basic/regexpLastIndexReset.js
@@ -0,0 +1,26 @@
+// Bug 1207922 - lastIndex should be reset to 0 when match fails.
+
+var pattern = /abc/;
+var string = 'aaaaaaaa';
+
+function test() {
+  pattern.lastIndex = 3;
+  var result = pattern.exec(string);
+  assertEq(result, null);
+  assertEq(pattern.lastIndex, 3);
+}
+
+for (let i = 0; i < 10; i++) {
+  test();
+}
+
+function test2() {
+  pattern.lastIndex = 3;
+  var result = pattern.test(string);
+  assertEq(result, false);
+  assertEq(pattern.lastIndex, 3);
+}
+
+for (let i = 0; i < 10; i++) {
+  test2();
+}