Unexpected behaviour of string.gmatch
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- Subject: Unexpected behaviour of string.gmatch
- From: Stefan Beyer <stefan.beyer@...>
- Date: 2006年8月19日 22:49:31 +0200
I do not understand the behaviour of string.gmatch (using Lua 5.1.1)
I was writing this, to split a csv string:
function split(str)
local t = {}
for e in string.gmatch(str,"([^,]*),?") do
table.insert(t,e)
end
return t
end
Here the result:
split("1,Test") -> {'1','Test',''} -- nok
split(",4") -> {'','4',''} -- nok
split("2,") -> {'2',''} -- ok !!
To make the function work as expected, I had to 'artificially' break
at the end of the string:
function split2(str)
local t = {}
for e,c in string.gmatch(str,"([^,]*)(,?)") do
table.insert(t,e)
if c == "" then break end
end
return t
end
which produces what I expect:
split("1,Test") -> {'1','Test'} -- ok
split(",4") -> {'','4'} -- ok
split("2,") -> {'2',''} -- ok
What is going on? Did I miss something?
Any help appreciated, thanks! Stefan