It is mandatory for a `@DataProvider` method to return the data in the form of double array of Object class (**Object [][]**). The first array represents a data set where as the second array contains the parameter values.
If a test method belongs to both included and excluded group, the excluded group takes the priority and the test method will be excluded from the test execution.
To use regular expressions to include and exclude groups you have to use .* for matching names. We can also use it for searching groups that contains a certain string in their names by using the expression at start and end of the search string (for example, .*name.*).