Questions about INSTR

[mdijkens]

Would it be a big deal to update QB64 Phoenix so that it can handle longer strings? Maybe even as big as +/- 2^63. Or would that compromise other stuff?

I hope that will happen someday

Last night I downloaded a pi listing of 10 billion decimal places, but obviously i can't use it at this point.

This I don't understand? Of course you can use it! QB64 does not have a size limit on files or data in general.
I am reading/writing files 100x bigger then this with QB64, no problem at all.
Irrespective of the programming language used, huge data processing requires a different approach then small data processing:
You would look into processing it in blocks of for example 64MB or 1GB. In QB64 you can use _MEM to store it but (of course) only up to the limit of your pc memory.