azure saml claims

Seems like the claims transform rule with azure sso are a bit more restrictive,  I'm trying to do something like the following which is an adfs based claims rule.

c:[Type == "http://schemas.xmlsoap.org/claims/Group", Value =~ "^(?i)contractors"]
=> issue(claim = c);

I have one last rp that I need to be able to exclude groups with names like contractors,  am I missing something?