While working on a problem my codding partner and I spent far too long trying to figure out why nothing was working with the deployment tool that we where given. The team that maintains the tool told us that all the scripts that we needed to write, to filter and add additional logic to the deployment process, was supposed to be in groovy,

after a couple of hours of having nothing but failed runs, we started poring through the tools official documentation just to find out that the feature we where using used JavaScript instead of groovy. 2 minuets latter everything worked.

The most puzzling thing with the problem is that the code was executing and just having issues with the regular expression that we used on line 20 or so