Why Your GA4 Regex Keeps Failing — 2 Rules That Fix 99% of It
If you ever pasted a regex into Google Analytics 4 and got zero rows back while the exact same pattern works fine in your editor — you didn't write…
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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…
Accelerating Regex Filtering in Milvus with FMIndex Candidate Pruning
Accelerating Regex Filtering in Milvus with FMIndex Candidate Pruning Regex filtering is a powerful tool for querying complex string patterns, but i…
RERA Registered Projects in Noida: Validate in Python
If you build a listings app, a lead form, or even a spreadsheet for RERA registered projects in Noida, you will get bad RERA numbers. Some are typos…
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,…
Regex Cheatsheet for Beginners (With Copy-Paste Examples)
Regular expressions look cryptic at first, but a small set of building blocks covers most real-world tasks: validating input, searching logs, and do…
Regular Expressions Without the Fear
Most developers I know have a love-hate relationship with regex. They copy a pattern from Stack Overflow, it works, they move on, and they hope they…
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…
Из генерации — в переписку: доводим ответ ИИ-агента до клиента и CRM на n8n
Всем привет!) Напомню: в первой статье ( https://habr.com/ru/articles/1071580/ ) я показал дебаунс на Redis, который склеивает дробные сообщения кли…
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,…
The Regex That Took Down Cloudflare for 27 Minutes
On July 2, 2019, Cloudflare's entire network hit close to 100% CPU across every edge server handling HTTP and HTTPS traffic. Sites went down globall…
Stop letting your AI guess: The case for deterministic Regex in MCP
If you've ever asked an LLM to extract a list of emails from a massive support ticket transcript, you've already lost the battle of accuracy. You mi…
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…
I Built a Live Regex Tester on the Browser's RegExp Engine
Regex looks like line noise until you can see it match. So here's a regex tester that highlights matches live, lists your capture groups, and runs e…
Stop Copy-Pasting Regex You Don't Understand: 5 Patterns Explained
Stop Copy-Pasting Regex You Don't Understand: 5 Patterns Explained Every developer has done it: you Google "regex for email," copy the first Stack O…
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-…
Writing robust regular expressions for log lines
A regular expression that parses a log line in your editor and a regular expression that survives a week of real traffic are rarely the same express…
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…