| tst.js:3:2:3:3 | \\1 | There is no capture group 1 in this regular expression. |
| tst.js:6:13:6:14 | \\1 | There is no capture group 1 in this regular expression. |
| tst.js:12:16:12:17 | \\2 | There is no capture group 2 in this regular expression. |
| tst.js:13:16:13:29 | \\k<whitespace> | There is no capture group named 'whitespace' in this regular expression. |