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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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Text Hash Generator Field Guide: When MD5 Collides With Your Build, the SHA-256 Fingerprint Is the One That Saves You
MD5 still ships in production code, but the day it collides with your build, the…
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UUID Validator Field Guide: When a Well-Formed String Still Fails the Version and Variant Check
Most UUID bugs are well-formed strings carrying an unsupported version, non-conformant variant bits, or a sentinel value a regex waves through.
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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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OTP Generator Field Guide: How to Generate Codes That Survive Contact With Users
The best OTP is the kind users don't have to think about. When you ask…
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When the Five-Day Week Bites Back: A Field Guide to Business Day Calculator
A 5-day business week in a 7-day calendar is the source of every "add 7, ship Friday, miss Friday" mistake. Two operations, a no-holiday rule, and three lines of source — what this calculator actually does.
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Why Your XML Output Looks Wrong to a Stranger: A Field Guide to XML Formatter
Beautify, minify, and the four serializer decisions the XML spec deliberately leaves undefined — what a DOM-aware formatter actually changes.
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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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The Seven Case Formats Your Naming Convention Quietly Decides
A naming convention is a contract, and the dangerous part is the implicit clauses. Here is what a case converter makes visible and why your team should pick one policy and stick to it.
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The OpenAPI Diff Your CI Does Not Run: Why Two Specs Can Look Compatible and Still Break Every Client
The breaking change you ship to production is almost never the one a human reviews.…