1// Copyright JS Foundation and other contributors, http://js.foundation
2//
3// Licensed under the Apache License, Version 2.0 (the "License");
4// you may not use this file except in compliance with the License.
5// You may obtain a copy of the License at
6//
7//     http://www.apache.org/licenses/LICENSE-2.0
8//
9// Unless required by applicable law or agreed to in writing, software
10// distributed under the License is distributed on an "AS IS" BASIS
11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12// See the License for the specific language governing permissions and
13// limitations under the License.
14
15var r;
16
17r = new RegExp ("(a)b\\1").exec("aba");
18assert (r[0] == "aba");
19assert (r[1] == "a");
20
21r = new RegExp ("(a)b\\1").exec("b");
22assert (r == undefined);
23
24r = new RegExp ("(a)*b\\1").exec("b");
25assert (r[0] == "b");
26assert (r[1] == undefined);
27
28assert (JSON.stringify (/[[]?(a)\1/.exec("aa")) === '["aa","a"]');
29assert (JSON.stringify (/\1{2,5}()\B/.exec("asd")) === '["",""]');
30