Use the Perl RegEx engine everywhere in SCOM
Modify the RegEx engine leveraged by the expression filters (& possibly elsewhere in SCOM) from the .NET Framework RegEx engine, to the Perl engine that is leveraged by the group calculator module. Doing so would bring the following benefits:
1 - Consistency in the interpretation of regular expressions throughout SCOM;
2 - A more flexible experience using regular expressions in the context of expression filters, as the Perl engine offers support for RegEx functionality that is not available with the .NET Framework engine, such as the support for certain "Character Classes" (ex.: \d for digit) & "Assertions" (i.e. [Negative] Look(ahead|behind)).