match last integer from behind

Question

i have those strings

hello,world,1.fin
hello,world,start11.fin
hello,world,start11,then,end22.fin
hello,world,111,then,222,then,end333.fin
hello,world,111,then,222,then,end333threes.fin
hello,world,111,then,222,then,end333threes.fin444

and i need to match the endings numbers only before the . and after world, and i expect to get

1
11
22
333
333
333

i tried this but it does not match the last case ,world,.*?(\d+)\. link then i tried this but it only get from begin ,world,.*?(\d+).*\. link

.fin is not static and it does change randomly to .fin444 or .444

Answer 1

This should work

,world,.*?(\d+)[^\d]*\.

See https://regex101.com/r/ilIsJb/1