output substring validation

Hello, I need some assistance with the "output substring" validation function. I'm running 5.1.403 with web console version 5.1.395.

I want to do check the output for "Error" like the example in the wizard,

@REGEX:.*(?![Ee]rror).*)

But that example is not valid because it's missing a parenthesis, and no variation I have tried seems to catch anything. I don't have much experience using look-aheads or negative matches.

So a couple of questions have come to mind.

What flavor of regex is the scheduler using?

Assuming I did have a valid regex, how does the output string validation interact with with the exit code validation? If you have a good exit code and no match in the substring check, what happens? What about bad exit code but a match in the substring check?

There is a typo, the first ( is missing. please use @REGEX:.*((?![Ee]rror).)* You can also try @REGEX:^((?!Error).)*$ which will check the string doesn't contain word "Error" in any position (case sensitive). This an alternative version of the first expression. for case insensitive, replace E with [Ee]. If you only need to test for cases of text starting with "Error" then you can use a more efficient @REGEX:^(?!Error).*$