Regex in Firefox: Named Groups, Unicode Support, and DevTools Debugging
Firefox's DevTools include regex testing capabilities, and Firefox's JavaScript engine has some regex-specific features worth knowing for developers…
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30 Practical JavaScript Regex Patterns With Examples and Tests
Regular expressions are useful for input validation, text extraction, log analysis, and everyday JavaScript development. But copying a regex from th…
Go regexp too slow? I built coregex, a drop-in replacement. An audit found 16 bugs — here's what broke
Six months ago I published "Go's Regexp is Slow. So I Built My Own" . The project grew, got contributors, beat Rust on several patterns. Tested on G…
Testing automata-theory exercises in the browser: a regex flavor for CS coursework
If you've ever taught or taken a formal languages course, you know the workflow: the exercise says write a regular expression for all strings over {…
How I built a VS Code extension that draws Railroad diagrams for regex and catches ReDoS
It started with frustration. I write code every day. And every time I need a regex more complex than \d+, the same thing happens: I open my browser,…
Как я перенёс сборку лексера в compile-time
Я написал source generator для лексера HydraScript . Он собирал регулярное выражение из описаний токенов. После этого мне оставалось скопировать рег…
I built a ReDoS scanner that proves each bug offline — and hands you a verified fix
Most ReDoS linters tell you a regex is "possibly vulnerable" and leave you to figure out whether they're right. I got tired of that, so I built a to…
Four filters returned nothing and I read all four as nothing being there
All four happened on 2026-09-04. Each one is a filter that came back empty, and each time I read the empty result as a statement about the world ins…
25+ useful and commonly used Regular Expressions
Regular Expressions (Regex) are expressions that define a search pattern. Regex can be implemented in various tasks including searching, replacing,…
Why You Shouldn't Paste Private Logs Into Cloud Regex Testers 🔍
When debugging a complex regular expression—whether you're parsing user emails, server transaction logs, or customer database records—having a visua…
Why Your Regex Works in Testing But Breaks in Production
You write a regex. You test it against two or three sample strings. It matches perfectly. You ship it. Three days later, someone opens a bug report…
A Dart regex that cannot be made to hang
FFI binding to Google's RE2. Matching runs in linear time, so no catastrophic backtracking. Here is a validator that ships in a lot of Dart code. It…
5 Signs Your Regex Is Wrong (and How to Spot Them in Seconds)
We've all been there. You write a regex, it looks correct, you deploy it... and then the bug reports roll in. Regex is deceptively tricky — what loo…
A Test-Matrix Workflow for Debugging JavaScript Regular Expressions
AI-assisted disclosure: This article was prepared with AI assistance. Every JavaScript example was executed with the companion Node.js validation sc…
How to Design an Effective Referral Reward System: A Complete Technical Guide for SaaS
A well-designed referral program can be the highest-ROI customer acquisition channel for SaaS products, with referred customers typically having 25-…
How to Debug Complex Regex Patterns Offline Without Leaking Proprietary Data
Introduction: The Production Log Nightmare It is 2:15 AM on a Thursday. Production is throwing 500 errors because a newly introduced log parser is f…