Ah! My bad. I misread the docs - "result" is the input, while the "n" 
indexes are actually the values of the submatches, not the indexes. I still 
think it's confusing, but makes more sense when I write it like this: 
https://go.dev/play/p/SHl_aSU3kPZ 

On Thursday 14 December 2023 at 09:06:00 UTC Brian Candler wrote:

> [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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