OPAL case sensitive filtering with tilde and regex

OPAL filters are case-insensitive by default. Case sensitive filtering is used with the filter ~ operator and a regular expression.

filter tilde ~ operator and regular expressions

Use the filter ~ operator support for regular expressions with the case insensitivity regex flag for case insensitive match to a string. log: 2024-04-06T12:49:00Z,eventName=GetPolicy

filter eventName~/getpolicy/  //does not match
filter eventName~/getpolicy/i //matches