The headline needs to convey: finding catastrophic backtracking regexes before shipping, using a free checker/API called ReDoScan.

Short summary

Catastrophic backtracking in regexes (CWE-1333/ReDoS) can pin CPUs at 100% with crafted inputs across all major backtracking-based engines. This tutorial explains three dangerous pattern constructs—nested quantifiers, overlapping alternation, and prefix overlap—and demonstrates detection via ReDoScan, a REST API and web checker built by the author. It includes practical CI/CD integration examples using batch scanning to fail builds on high-risk regex patterns.

• •Explains three regex constructs that cause exponential backtracking: nested quantifiers, overlapping alternation, and prefix overlap
• •Demonstrates ReDoScan API for static and dynamic regex risk analysis with curl and Python examples
• •Shows CI/CD batch integration to automatically fail builds on high or critical risk patterns

Generated with AI, which can make mistakes.