That does not return the correct answer for the original poster's request.
flpg=#select position('om' in reverse('Tomomasaaaaaaaaaaa'));
position
----------
15
(1 row)
Easy oversight to make - if you reverse the string being searched you must also reverse the string that you are looking for.
That said the OP hasn't actually defined what they mean by "locate" when considered in a backward sense - some length adjustments might be needed to compensate for the length of the term being searched for.
Patches are welcomed. Given the lack of any links to previous requests of this nature I'd say its not exactly a highly in-demand capability.
David J.
