Ping

local players = game:GetService("Players")
local function getPlayers(text)
    print(text)
    if not text then return {} end
    if text == "everyone" or text == "here" then
        return players:GetPlayers()
    else
        local tab = {}
        for i, v in pairs(players:GetPlayers()) do
            if v.Name:lower():sub(1, #text) == text:lower() and text ~= "" then
                table.insert(tab, v)
            end
        end
        return tab
    end
end

local function chatted(msg)
    for i = 1, #msg do
        local prev = msg:sub(i - 1, i - 1)
        if msg:sub(i, i) == "@" and (prev == "" or string.match(prev, "%s")) then
            for _, plyr in pairs(getPlayers(string.match(msg:sub(i + 1), "^%S*"))) do
                if plyr then
                    local pgui = plyr:findFirstChildOfClass("PlayerGui")
                    if pgui then
                        local sound = Instance.new("Sound", pgui)
                        sound.Name = "Ping_RBX"
                        sound.Volume = 1
                        sound.SoundId = "rbxassetid://570433034"
                        sound:Play()
                        sound.Ended:Connect(function() sound:Destroy() end)
                    end
                end
            end
        end
    end
end

for i, v in pairs(players:GetChildren()) do
    v.Chatted:Connect(chatted)
end

players.PlayerAdded:Connect(function(p)
    p.Chatted:Connect(chatted)
end)