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2014-03-02 9:06 GMT+02:00 Coroutines <>:

> This does not:
>> = string.find('cat', 'cat', -31, true)
> 1 3

> I expect it to match the string at the index I passed to it, not
> silently reposition the start at a valid index (1).

All the string functions do that. It is documented under string.sub.

| If, after the translation of negative indices, i is less than 1, it
is corrected to 1.