Main Script

local message = "im so lonely"
local allowedChars = "abcdefghijklmnopqrstuvwxyz "
allowedChars = allowedChars:split("")

local createNPCs = require(script:WaitForChild("CreateNPCs"))

function filterMessage(msg: string)

    msg = msg:lower()
    local filteredMsg = ""

    for _, char in pairs(msg:split("")) do

        if table.find(allowedChars, char) then
            filteredMsg = filteredMsg .. char
        end
    end

    return filteredMsg
end

game.Players.PlayerAdded:Connect(function(plr)

    plr.Chatted:Connect(function(msg, _recipient)

        msg = filterMessage(msg)

        if msg == message then

            createNPCs(plr)
        end
    end)
end)