Can someone help me with this :match(pattern) thing?

so , heres the script that im having problems

song_ID = {667769312,434073638,505485739,609713752,234306650,724754013,674965340,171793804,786383825,608764973,673608391,222689365,550124516,928322158,875306394,217536597,604028863,853128403,345505502,457308171,433861213,188539793,180676949,156714215,854879012,163749020,479336769,786463391,821734599,821747544,381035983}

randomizer = true

inc = .05 

pattern = "^%d+"

asset_ID = "rbxassetid://"
function choose(tab) local obj = tab[math.random(1,#tab)] return obj end
function play(s) if s:IsA("Sound") then local o = s.Volume s.Volume = 0 s:play() for i = 0,o,inc do wait() s.Volume = i end s.Volume = o end end
function stop(s) if s:IsA("Sound") then local o = s.Volume for i = o,0,-inc do wait() s.Volume = i end s:stop() s.Volume = o end end
song = game.Workspace.Sound



counter = 1
if #song_ID > 0 then
while true do
wait()
if randomizer then song.SoundId = asset_ID..""..choose(song_ID) else song.SoundId = asset_ID..""..song_ID[counter] end
play(song)
wait(song.TimeLength:match(pattern)   --I guess you know what im trying to do , the TimeLength looks like this 119.4325537467 , the pattern should remove the .4325537467 so the wait thing wont glitch the BOI out.
stop(song)
if counter >= #song_ID then counter = 1 else counter = counter + 1 end
end
end