src/third_party/mozjs-45/js/src/jit-test/tests/basic/bug691797-regexp-2.js

var re = /.*(a\w).*/i;
var str = "abccccccad";
for (var k = 0; k < 100; k++) {
  re.test(str);
  assertEq('ad', RegExp['$1']);
}