Re: Lua 5.3.3 empty match behaviour with the '-' modifier

[Roberto Ierusalimschy <roberto@...>]

> Lua 5.3.3  Copyright (C) 1994-2016 Lua.org, PUC-Rio
> > =(";a;"):gsub("a-", "ITEM")
> ITEM;ITEMaITEM;ITEM    4
> 
> I.e. the substring 'a' in ";a;" is not recognized as an instance
> of the pattern "a-".

The substring 'a' is not an instance of the pattern "a-", given that
'' is also valid and shorter than 'a'. So, this behavior seems correct.


> The new behaviour is so far documented only in the list of changes
> [2], not in the manual.

Officially, the behavior is still undefined :-)

-- Roberto