backrefs comparison 4

https://backrefsevaluationspark.evergrovio.com/posts/why-you-need-a-backrefs-evaluation-checklist-for-smarter-link-audits

When comparing backrefs, you're essentially checking if two different parts of a string match the same captured group, which is super handy for tasks like finding repeated words or validating paired patterns like HTML tags. It's a neat feature in regex that adds a layer of context-aware matching.