[Lua] toLower toUpper?

Hi all.

Is it possible to use a function similar to toLower(string) to ex. compare 2 strings - no matter if it's upper/lower-case or a mix of both?

There currently isn't a function in the string library that can compare whether a string is uppercase or lowercase, but it's really easy to do. (I assume what you ment was you were wanting to check if a string was completely uppercase or lowercase).

s = "your MuLtIcAsE string here..."


if string.lower(s) == s then
  -- It is all lowercase
elseif string.upper(s) == s then
  -- It is all uppercase
end

-- OR using a different notation:
if s:lower() == s then
  -- It is all lowercase
elseif s:upper() == s then
  -- It is all uppercase
end

A function to check if two strings are the same?

stringToCompare = "hello"

function checkIgnoreCase( yourString, checkString )
    return string.lower(yourString) == string.lower(checkString)
end

print("Type hello!")
input = read()

if checkIgnoreCase( input, stringToCompare ) then
    print("Yes you wrote " .. stringToCompare)
else
    print("No what crap did you write? " .. input)
end

Basically, you just string.lower(string) both things you are checking to see if they're equal.

Thanks that's exactly what i was looking for.
- I now notice that i explained my problem a bit wrong, as it wasn't the actual compare function i was looking for, but simply if i could force a string to BECOME lower/uppercase.

I forgot when i needed it, but i just came to think of it again :)/>

I usually do it with user inputs, if they have to type "yes" and type "yEs" then i assume it wouldn't accept it as it's not EXACTLY the same.
So in my last code, i had to type eg.

if myString == "yes" or myString == "YES" or ...

which becomes very tedious in the long run ;)/>

Yeah, with the function I had you would use it like this:

if checkIgnoreCase(myString, "yes") then
-- if it's equal
else
-- if it's not equal
end