On Thursday, 26 August 2021 at 13:27:01 UTC+2 kziem...@gmail.com wrote:
 

> Line "early regular expression implementations used and that POSIX 
> specifies" is a bit confusing to me. I guess it can mean "old 
> implementations Go regexp package", 

This guess is wrong. Go's regexp package did and does not change (in that 
respect).
 

> but also very old implementations of regular expressions in different 
> languages and systems (?). 

This is the correct meaning of the sentence.
 
V.

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