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Building a Local PII Privacy Gate for AI Coding Assistants

How I built a hybrid regex + on-device LLM scanner that blocks prompts containing PII before they reach cloud APIs — zero data leaves the device.

Regex vs On-Device LLM for PII Detection: A 25-Case Benchmark

A comprehensive benchmark comparing regex pattern matching against Apple's on-device Foundation Models for PII detection — 52% F1 vs 100% F1, and why binary classification beats extraction.