Hi, i am a network engineer so i will try to help you.
Do you have an example for me?
Are you using only the string block in Manage Rule and search for a string or do you using Advanced Config Search?
Do you want something like that:
Of course you can use the RegEx for new lines ".*\n(.*\n)*.*".
You find further RegEx for Compliance Policies here:
Kind regards,
Flo