Dmitry Gozman ac3600ec96
feat: explain that argument is a regex (#28590)
- in docs;
- in the error message.

Terminal output:

```
$ npx playwright test foobar
Error: No tests found.
Make sure that arguments are regular expressions matching test files.
You may need to escape symbols like "$" or "*" and quote the arguments.
```

References #28551.
2023-12-11 17:35:39 -08:00
..