See https://stackoverflow.com/questions/66212287/what-characters-are-allowed-in-the-name-of-a-rule-in-drools

I think I have discovered, anecdotally, that some "grouping" characters do not work in rule names (seems rules named with can't be found or aren't included) - or at least, in extension rules (the extended rule seems to work with grouping chars, but not its extension; example below): The grouping chars include parentheses "()", square brackets "[]", and "curly braces" "{}". Although less than & greater than "<>" work, so I'm so far replacing the former with the latter.

Or are there escape chars for the problematic grouping chars?

Example:

rule "(grouping chars, and commas, work here)"
when
// conditions LHS
then
end

// removing parentheses, or replacing with < >,
// from below line works
rule "(grouping chars DON'T work here)"
extends "(grouping chars, and commas, work here)"
when
then
// consequences RHS