How to write and continuously test vulnerability detection rules for SAST

What this post added

This post details the development of a framework for writing and continuously testing vulnerability detection rules for SAST, specifically for migrating from existing SAST tools to Semgrep. The framework addresses rule management by using a central Git repository for rules and test cases, rule testing through automated gap analysis comparing original analyzers with Semgrep rule-sets, and analyzer replacement by ensuring parity between the old and new tools. This enables a more efficient and maintainable SAST process.