/TestCaseFilter: Run tests that match the given expression. is of the format Operator | where Operator is one of =, != or ...

/TestCaseFilter:
      Run tests that match the given expression.
       is of the format Operator[|]
         where Operator is one of =, != or ~  (Operator ~ has 'contains'
         semantics and is applicable for string properties like DisplayName).
         Parenthesis () can be used to group sub-expressions.
      Examples: /TestCaseFilter:"Priority=1"
                /TestCaseFilter:"(FullyQualifiedName~Nightly
                                  |Name=MyTestMethod)"