Long-form posts on regex performance, ReDoS, and common-pattern pitfalls.https://regex.tooljo.com/en-ushttps://regex.tooljo.com/blog/catastrophic-backtracking-patterns/https://regex.tooljo.com/blog/catastrophic-backtracking-patterns/Catastrophic backtracking turns an O(n) regex into an O(2^n) regex. Here are the five patterns I've seen take down production, and how to fix them.Tue, 28 Apr 2026 00:00:00 GMThttps://regex.tooljo.com/blog/30-regex-oneliners/https://regex.tooljo.com/blog/30-regex-oneliners/A field guide to the patterns that come up over and over: emails, URLs, UUIDs, dates, phone numbers, version strings. Each one is annotated, scored on real-world reliability, and paired with a tester deep-link.Mon, 27 Apr 2026 00:00:00 GMT