Separate numbers between character

[Kpim]

Hi

I have a dataset containing ref no : uf9m458700m7844132mn

                                                                         uf8m276932m789721mn

                                                                          uf7m908732m2681mn

How can I get the numbers between the m's at the end considering that the number is inconsistent? 

[Vegar · Accepted solution]

Maybe like this:

subfield([field],'m',3)