A repository that catalogs security vulnerabilities found in regular expressions commonly implemented in Web Application Firewalls (WAFs). The resource provides detailed documentation of bypass techniques and examples that demonstrate how attackers can circumvent regex-based security controls. The cheatsheet focuses on high-severity issues and includes practical examples of regex patterns that can be exploited. It serves as a reference for security professionals to understand common weaknesses in regex implementations used for input validation and filtering. The repository includes SAST (Static Application Security Testing) tools designed to identify vulnerabilities in custom regular expressions. These tools help developers and security teams analyze their regex patterns for potential security flaws before deployment. Originally presented at BlackHat USA 2016, the resource has been maintained and updated to reflect current bypass techniques and vulnerability patterns. It provides both offensive and defensive perspectives on regex security, making it valuable for penetration testers, security researchers, and developers working on WAF implementations.