Regex Template Builder

Regex Template Builder — Blog https://regex-template-builder.pages.dev/blog/ Guides and explainers from Regex Template Builder en-us URL Validation Regex: The Practical Pattern, and When to Skip Regex Entirely https://regex-template-builder.pages.dev/blog/url-validation-regex-best-pattern https://regex-template-builder.pages.dev/blog/url-validation-regex-best-pattern The one URL regex worth keeping, explained in plain English, plus the decision rules for when a parser beats a pattern. Sun, 04 Oct 2026 12:00:00 GMT Catastrophic Backtracking: The Regex That Took Down Cloudflare for 27 Minutes https://regex-template-builder.pages.dev/blog/regex-catastrophic-backtracking https://regex-template-builder.pages.dev/blog/regex-catastrophic-backtracking In July 2019, one regex took Cloudflare offline for 27 minutes. How catastrophic backtracking works, the real step counts, and the fixes that turn exponential into linear. Sat, 03 Oct 2026 12:00:00 GMT Why Most Email Regex Patterns Are Wrong (And What to Use Instead) https://regex-template-builder.pages.dev/blog/email-regex-validation-mistakes https://regex-template-builder.pages.dev/blog/email-regex-validation-mistakes Strict email regexes reject real customers: apostrophes, plus addressing, new TLDs. Here is the pragmatic pattern to use and the confirmation flow that actually validates. Thu, 01 Oct 2026 18:42:42 GMT Phone Number Regex: Why You Should Not Write Your Own https://regex-template-builder.pages.dev/blog/phone-number-regex-vs-libphonenumber https://regex-template-builder.pages.dev/blog/phone-number-regex-vs-libphonenumber A regex cannot know 200+ national numbering plans. Here is what goes wrong with homemade phone patterns and how libphonenumber solves it in 80KB. Thu, 01 Oct 2026 18:42:42 GMT