string.upper

local result = string.upper(input)

local result = string.upper("hello")

engine.print("info", result) --'HELLO'

local result = string.upper("Hello World")

engine.print("info", result) --'HELLO WORLD'

local result = string.upper("ALREADY UPPERCASE")

engine.print("info", result) --'ALREADY UPPERCASE'

local result = string.upper("abc123!@#")

engine.print("info", result) --'ABC123!@#'

local str1 = "Hello"
local str2 = "hello"

if string.upper(str1) == string.upper(str2) then
    engine.print("info", "Strings are equal (case-insensitive)")
end

local input = "yes"

if string.upper(input) == "YES" then
    engine.print("info", "User confirmed")
end

local varName = "max_value"
local constant = string.upper(varName)

engine.print("info", constant) --'MAX_VALUE'

local text = "warning"
local emphasized = string.upper(text)

engine.print("info", emphasized) --'WARNING'

local status = "active"
local enum = string.upper(status)

engine.print("info", enum) --'ACTIVE'

local result = string.upper("123456")

engine.print("info", result) --'123456'

local result = string.upper("")

engine.print("info", result) --''

local title = "my document title"
local header = string.upper(title)

engine.print("info", header) --'MY DOCUMENT TITLE'

local column = "user_id"

engine.print("info", string.upper(column)) --'USER_ID'

local function equalsIgnoreCase(a, b)
    return string.upper(a) == string.upper(b)
end

engine.print("info", equalsIgnoreCase("Test", "test")) --true

local cmd = "help"

engine.print("info", "Command: "..string.upper(cmd)) --'Command: HELP'

local text = "hypertext markup language"
local acronym = ""
for word in string.gmatch(text, "%S+") do
    acronym = acronym..string.upper(string.sub(word, 1, 1))
end

engine.print("info", acronym) --'HML'

local name = "my_variable_name"
local shouty = string.upper(name)

engine.print("info", shouty) --'MY_VARIABLE_NAME'