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Regex Cheat Sheet Field Guide: The Five Symbols Between You and a Working Pattern
Regex is one of the few programming primitives you relearn every year, and a cheat…
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The Regex Cheat Sheet That Actually Gets Used: A Field Guide to Reading Patterns Faster
The Regex Cheat Sheet That Actually Gets Used: A Field Guide to Reading Patterns Faster…
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Your Regex Passed the Test. The Backtracking Trace Says It Is Still Broken
Your regex returns the expected match on 3 sample strings, so is the job done?…
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Why Your Profanity Filter Misses 1337: Catch the Mixed-Token Bypass
Your filter blocks a banned word, but does it still recognize the same word after…
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The Regex That Hangs Your Server at 3 a.m. — A Pre-Commit Guide
Five catastrophic-backtracking categories, four mechanical rewrites, and a 60-second pre-commit check that beats every ReDoS post-mortem.
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Batch Email Validation: From RFC 5321 Syntax to Real-World Deliverability
A batch email validator parses, normalises, and rates an entire list in one pass — and the gaps it leaves behind are exactly the gaps that matter when you decide which addresses to keep, quarantine, or drop.
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Three Regexes Catch 95% of PDF PII — And the Two That Always Slip Through
The default pattern set leaves your team compliant on the day you enable it and exposed the day you forget a field. Here is the two-pass review workflow that survives a real audit.
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The Three Dials That Decide Whether Your Regex Explainer Is Lying
A regex explainer that ignores the dialect dropdown will silently misdescribe your pattern. The three controls in the right column are the boundary between a tool that explains and a tool that lies.
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The three text-formatting decisions that decide whether your extracted numbers are real
Three text-formatting decisions quietly decide whether the numbers you pull from a paragraph are real…
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The Three Country Codes That Quietly Decide Your Phone Number Extract
The Three Country Codes That Quietly Decide Your Phone Number Extract A paste of customer…