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Regex Linter Field Guide: When Five ReDoS Shapes Hide Inside One Line of Regex
One misplaced quantifier inside one capture group can take down the API on a Tuesday…
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Bulk Email Extractor Field Guide: When Plus-Addressing, Gmail Dotted Aliasing, and Trailing Dots Slip Past Naive Regex
A field guide to the five failure patterns bulk email regex silently misses: plus-tagging, dotted aliasing, trailing dots, case-insensitive dedup, and the two-stage normalization your downstream pipeline needs.
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Vowel-Consonant Processor Field Guide: When Letter Inventory Beats Naive String Counting
Counting vowels is the kind of task every junior developer thinks they can do in…
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Markdown Link Extractor Field Guide: When Four Kinds of Links and the Seven-Field Record Decide What Your README Actually Points At — 2026-09-28
A markdown file with a handful of [label](url) lines looks innocent until you try to…
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Regex Debugger Field Guide: When Five Decisions, One Trace Timeline, and the Backtrack Panel Decide Whether Your Regex Lands a Match or Burns 10 ms on a Catastrophic Pattern
A regex that "works" in your editor can quietly do three different things when you…
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Markdown Link Extractor Field Guide: When Five Link Shapes, Three Failure Modes, and One Status Flag Decide Whether Your 4,000-Line README Lands in a Triage Queue
Markdown link extraction breaks for one of three reasons — invisible Unicode whitespace inside inline…
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Sentence Case Converter Field Guide: When Four Heuristics Decide What ‘I’ Becomes
A capital letter is not the same thing as a sentence break. A 1,200-word draft…
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Bulk Email Extractor Field Guide: When Your Regex Returns the Wrong 47 of 53 Addresses
A four-stage pipeline for bulk email extraction: tokenize, match, validate, deduplicate. The rules that catch what the regex leaves behind.
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ReDoS Scanner Field Guide: When One Regex Holds the Whole Request Thread
One nested-quantifier group inside a single JavaScript regex can pin a Node event loop at…
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Regex Railroad Diagram Visualizer Field Guide
A railroad diagram is the easiest way to see what a regex actually means. Paste…