It may be differences in the Regex libraries between Windows. I’ve found that some AIX and Linux distros don’t support matching \w for word, for example. There was a longer discussion here in the forum, I’ll try to find it, but it boils down to the safest methods are to use only POSIX expressions like
[:[space]:] instead of
I don’t know a good way to test ActionScript on Mac other than running the action, but you can test the Relevance remotely. You can use the BigFix Query app in WebUI, or in the Fixlet Debugger you can now Evaluate Using - Remote Query to remotely target your Mac to test the relevance.