Tutorials, deep-dives, and privacy-first thinking about developer tools.
Showing 1–6 of 6 posts
A UUID regex that only checks the 8-4-4-4-12 shape accepts garbage. Here's how to validate the version and variant nibbles the way RFC 9562 defines them.
A practical guide to regex find and replace in VS Code: capture groups, $1 substitution, case modifiers, and the side-by-side diff preview.
Learn regex for log parsing: copy-ready patterns to extract timestamps, IPv4 addresses, and HTTP status codes from access logs, with named capture groups.
How to validate phone numbers with regex across country formats: the E.164 pattern that always works, US patterns, and where regex stops working.
Understand regex capture groups, backreferences, and the $1, $&, and $<name> replacement tokens — with copy-paste JavaScript examples that actually work.
Compare strict vs loose email regex patterns, see why the RFC 5322 'official' regex is a trap, and learn the one validation pattern you should actually use.