Email validation uses RegExp to make sure that emails are formatted correctly. Phone number validation only accepts numbers. Strong passwords are enforced by password validation. Verify the passwords ...

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 ...

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).