Here is a solution based on comments above. Yet, we will need you to answer these comments so we can refine the approach. Assuming
data = {'NCCINS.AttitudePositionINS1.Pitch', 'NCCINS.AttitudePositionINS1.Roll'} ;
we perform a single call to REGEXP on a comma-separated merger of the original strings, as follows:
pattern = '(\w{3})(\w{3}).(.[^A-Z]+)(.[^A-Z]+)([^\.]+).([^,]+)' ;
tokens = regexp( sprintf('%s,', data{:}), pattern, 'tokens' ) ;
with that, we get
>> tokens{1}
ans =
'NCC' 'INS' 'Attitude' 'Position' 'INS1' 'Pitch'
>> tokens{2}
ans =
'NCC' 'INS' 'Attitude' 'Position' 'INS1' 'Roll'
