I am working on a product that uses REGEX and matches it. 
The regex is tested both on the client-side (using the JavaScript REGEX engine) and both on the server-side.

But I couldn't find one word about the way intersystems parses the regex, It is quite elementary to state which which engine it works with. 

from what I could gather from early implementations and such, the engine is based off PCRE, But I need to confirm this somehow, Can anyone give me a definitive answer, Is there any tool to test the regex other than writing it myself??
 

And just to clarify, YES - i found values that would test false in client but test true on server and vice versa, For the exact same regex, So obviously the engine is different..

* My goal is to be able to craft unified regex for both engines to avoid duplicate regex that required maintance...