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Seven Characters, One Check Digit: Catch a Bad SEDOL Before It Reaches Your Books
A practical guide to SEDOL-7 format rules, weighted mod-10 validation, and where securities-data pipelines should catch a bad identifier.
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Before You Crawl Your Docs, Inventory the Links in the Markdown
Five link forms, two reference passes, and a five-stage audit walk-through for the Markdown Link Extractor on Elysia Tools.
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Chat Transcript to PDF: How to Turn JSON Conversations into Bubble-Style Documents
A working walkthrough of the Chat Transcript to PDF tool — JSON input shape, five layout switches, three raw-transcript pitfalls, and how it sits among the rest of the document-conversion family.
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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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Why R-Squared Lies to You When You Add Predictors
Adjusted R-squared is the correction that penalizes each new variable for not pulling its weight. Use it to compare nested models instead of chasing raw R².