Tutorials, deep-dives, and privacy-first thinking about developer tools.
Showing 1–6 of 6 posts
Five regex mistakes that make a pattern match too much — greedy .*, unescaped dots, missing anchors, loose alternation, nested quantifiers — with the fix for each.
Regex lookahead vs lookbehind, explained with five production patterns: password rules, thousands separators, price parsing, and camelCase splits.
A pattern that works in PCRE can silently break in JavaScript or Python re. Here are the regex flavor differences that explain why, with fixes for each.
How to match a URL with regex and survive the three edge cases that break most patterns: trailing punctuation, balanced parentheses, and scheme-less links.
Learn how to test a regex pattern online without writing code: paste, highlight, and debug matches, plus why the same regex passes in Python but fails in JS.
A practical regex cheatsheet for 2026: 25 ready-to-paste patterns for emails, URLs, dates, and log parsing, plus the syntax rules behind them.