some string help please

hey i want to make a folder name example STEAM_1_23456789 instead of STEAM_0:1:23456789
with lua so how would i do that to like convert a Player:SteamID() to hes steamid where the : are replaced with _


could it be like

local text = ply:SteamID()
text = string.Replace(text,":","_") // do this need to be twice?


never mind i g ot it to work with my own example ^^