public void Test_06_TestCreateRegularExpression( ) { FileFilters filter = new FileFilters( ); string filters = ( "Documents (*.docx; *.doc)|*.docx; *.doc||" ); filter.PopulateCollections( filters ); filter.CreateRegularExpressions( ); Regex regex = filter[ 0 ]; Assert.AreEqual( @"(.+\.docx$)|(.+\.doc$)", regex.ToString( ) ); }