Why is string.find() giving wrong output?

[rahul sharma <rahulatgslab@...>]

Hi, 

I have lua-5.1.4 installed. I fired the following commands:-
> a="0x12,0x23,0x1e"
> string.find(a,',',1)
> print(string.find(a,',',1))
5       5
> b="0x12.0x23.0x1e"

> print(string.find(a,'.',1))
1       1
>
Why is it giving such a wrong answer??