Is there something like string.lower or string.upper but to make only the first letter uppercase?

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#1

I want to know if there is something like string.lower or string.upper but only makes the first letter uppercase, if not, how do i make something like that?

#2

Just get the first letter of the character and make that uppercase.

local Text = "hello there"
local FirstLetter = string.sub(Text, 1, 1)
FirstLetter = FirstLetter:upper() -- Or :lower() depending on what you want to do
Text = FirstLetter..string.sub(Text, 2, -1)

There is no pre-made function for it. You just have to hard-code it in. You could also put it in one line like this:

(string.sub(String, 1, 1)):upper()..string.sub(String, 2, -1)

Although at that point, you might just want to make a function called firstUpper() or something. Hope this helped.

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#3

Found this on stackoverflow. Search before coming here, please.

function firstToUpper(str)
    return (str:gsub("^%l", string.upper))
end

It’s also shorter compared to @Batimius’ method.

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#4

That works, though in other languages it also makes the other letters lowercase, so what you could do is lowercase it before uppercasing the first letter

function firstToUpper(str)
    return (str:lower():gsub("^%l", string.upper))
end

print(firstToUpper("HELLO")) --Prints Hello
--OG Method would return the same string because it wouldn't lowercase
5 Likes
#5

Thank you for your solution
I even went further and improve it slightly for my case but maybe other will find it useful

local firstUpperExpression = "%^([ -]*%l)"
-- this will deal with situations where i have " " or "-" in front
 function firstToUpper(str)
    return (str:lower():gsub(firstUpperExpression , string.upper))
end

print(firstToUpper(" - HELLO")) --Prints: - Hello
print(firstToUpper("HeLLO")) --Prints: Hello
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