string with greek characters

local alphabet="αβγδ"
print("len="..#alphabet)
for i=1,#alphabet do
        print(string.sub(alphabet,i,i))
end

the 24 characters of http://www.lua.org/cgi-bin/demo represent the decimal numeric values of the Greek Unicode characters

what do the ?'s of the Corona SDK respresent?

the string.byte and string.char functions can be used to compute the length and the substring of a string that contains characters other than those of the english alphabet:

string.len=function(s)
        local len,k=0,1
        while k<=#s do
                len=len+1
                if string.byte(s,k)<=190 then k=k+1 else k=k+2 end
        end
        return len
end
 
string.sub=function(s,i,j)
        local chars={}
        local k=1
        while k<=#s do
                local byte1=string.byte(s,k)
                if byte1<=190 then
                        chars[#chars+1]=string.char(byte1)
                        k=k+1
                else
                        local byte2=string.byte(s,k+1)
                        chars[#chars+1]=string.char(byte1,byte2)
                        k=k+2
                end
        end
        local sub=""
        for m=i,j do
                sub=sub..chars[m]
        end
        return sub
end

Many thanks for this post. Just made my day.

views:1646 update：2011/10/5 21:23:48


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