Tagged: #javascript regex

Tutorials, deep-dives, and privacy-first thinking about developer tools.

Showing 1–4 of 4 posts

technical Jul 7, 2026 · 10 min

5 Common Regex Mistakes That Match Too Much (2026)

Five regex mistakes that make a pattern match too much — greedy .*, unescaped dots, missing anchors, loose alternation, nested quantifiers — with the fix for each.

technical Jun 24, 2026 · 10 min

Regex Lookahead vs Lookbehind: 5 Real Examples (2026)

Regex lookahead vs lookbehind, explained with five production patterns: password rules, thousands separators, price parsing, and camelCase splits.

technical Jun 23, 2026 · 10 min

JavaScript vs PCRE vs Python Regex: Why It Fails (2026)

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.

tutorial Jun 20, 2026 · 10 min

How to Match a URL with Regex: 3 Edge Cases (2026)

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.