[lightspark]

Don't use hardcoded strings like "SPACE", "INSERT", "(s%-)", use global variables instead, e.g. SHIFT_KEY_TEXT, KEY_SPACE, KEY_INSERT, cuz different languages use different names for said keys

I do something like this and it works fine...

local name = button:GetName()
local bType = button.buttonType
 
if not bType then
    if name and not string.match(name, "Stance") then
        if string.match(name, "PetAction") then
            bType = "BONUSACTIONBUTTON"
        else
            bType = "ACTIONBUTTON"
        end
    end
end
 
local text = bType and GetBindingText(GetBindingKey(bType..button:GetID())) or ""
 
if text and text ~= "" then
    text = string.gsub(text, SHIFT_KEY_TEXT, "S")
    text = string.gsub(text, CTRL_KEY_TEXT, "C")
    text = string.gsub(text, ALT_KEY_TEXT, "A")
    text = string.gsub(text, KEY_BUTTON1, "LM")
    text = string.gsub(text, KEY_BUTTON2, "RM")
    text = string.gsub(text, KEY_BUTTON3, "MM")
    text = string.gsub(text, KEY_MOUSEWHEELDOWN, "MWD")
    text = string.gsub(text, KEY_MOUSEWHEELUP, "MWU")
    text = string.gsub(text, KEY_SPACE, "SP")
    text = string.gsub(text, "%-", "")
end

P.S. high lvl necromancy