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).

So I'm working with Cypress and I'm attempting to understand how to verify a URL via regex matching; but I want to use several character sets in the regex, and I want to add a variable as well.

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Many programming languages feature regular expressions—or “regex” for short—which are used to find patterns in strings of text. A regex library is a mini-language for describing patterns ...