Re: How to upgrade string.gsub() from 5.0.2 to 5.1 (beta)

[Romulo Bahiense <romulo@...>]

Henderson, Michael D wrote:
> Okay, I re-read Roberto Ierusalimschy's original post a couple three
> times and added an empty string to my return statement. I am not sure
> *why* it works, but it does.

Because of the new behavior of gsub, which now accepts a table (and not 
only a string or function).

Say:

local t = {Hello='World', foo='bar'}

1) print(string.gsub('Hello, foo!', '(%w+)', t))
> World, bar

2) print(string.gsub('Mister Anderson, Welcome back', '(%w+)', t))
> Mister Anderson, Welcome back


Note that number 2 didn't had an equivalent key on t, so gsub kept it 
(in other words: the old behavior would replace all words from the 
source string to "")


--rb