How to slice string with start and end not start and count?

[cobalt merlin]

string::substr required start index and count. I only have start index and end index. I cannot find any string method that offer such functionality. Should I implement slice function by myself or is there other way?

[solar nacelle]

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[cobalt merlin]

to clarify it more, let say I have this string hello
I want to get ell substring so I do s.substr(1, 3) but instead I got ello (i didn't test it, it probably would return other result but still its not what I want)
Yes I can do s.substr(1,2) to get ell but let say I don't know the count but I know the end index.

Ok I think I know how to solve this

I can do end - start to get the count. The code would like this:
s.substr(start, end - start)

!solved

[solar nacelle]

Thank you and let us know if you have any more questions!

[cobalt merlin]

!close