Test your regex before it breaks in production.
Rexact actually runs every pattern against your test cases, flags ReDoS blowups, and checks portability across 7 engines — free, no account needed.
What is Rexact for?Verification
Every pattern is actually run against your examples, never guessed by a model.
Security
Systematic ReDoS analysis: never a complacent "safe".
Portability
Compatibility checked across JS, PCRE, Python, RE2, Java, .NET and grep.