In some regex implementations there are only nine of them, however, with most contemporary Javascript implementations you can have up to 99 such capture-groups (where such groups are 1-based).

User Authentication Project This is a simple project for logging in users. It takes email and password, checks them using regex, and converts non-English numbers in inputs to English. If the data is ...

If a string route contains a regex-like text, say /hello\dworld, I believe it should be handled as an exact path; requests to /hello\dworld should be handled by the route, while hello5world should not ...