Regex PII scan: emails, US/CA (NANP) phones, dash-formatted national IDs (partial; Taiwan-format alphanumeric IDs not matched), loose passports, 64-hex crypto keys (may flag SHA-256), credit cards (contiguous IIN prefix + spaced/dashed 4-4-4-4 and 4-6-5, Luhn-checked), US SSNs, IPv4. Longest-match overlap resolution. Returns sanitized text. Max 50,000 chars. Expect false positives and misses; non-NANP phones not matched.

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