[a:b] gives you the elements from a to b-1 inclusive. So if you want the 
pair at position x, it has to be [x:x+2]

https://go.dev/play/p/3nvEfOjdfnj

On Thursday 14 December 2023 at 08:38:57 UTC Peter Galbavy wrote:

> I noticed today that the regexp docs read:
>
> If 'Index' is present, matches and submatches are identified by byte index 
> pairs within the input string: result[2*n:2*n+2] identifies the indexes of 
> the nth submatch. 
>
> I think that should be result[2*n:2*n+1] - at least in my code that's how 
> it is working.
>
> If I'm right, happy to raise a doc bug, but never done that, so not sure 
> how - for a one digit change?
>
> Peter
>

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