Regex Tester & Validator

This regex detects US Social Security Numbers (SSNs) and major credit card numbers for Data Loss Prevention (DLP) systems. It matches SSNs in formats like XXX-XX-XXXX, XXX XX XXXX, or 9 consecutive digits, and credit cards from major issuers including Visa, Mastercard, Amex, Discover, Diners Club, and JCB with optional separators. The pattern uses negative lookbehind/lookahead to avoid partial matches within longer digit sequences, reducing false positives in security scanning and compliance monitoring applications.