JS `split` don't work as expected?

I'm trying to split a string in two parts with the seperators "T" & "L".
T49.80000305175781L60.00000190734863

var xPos = xPos.split('T', 'L'); //Retus empty
var xPos = xPos.split(/T/, /L/); //Retus empty
var xPos = xPos.split(/T/); //Retus: ["", "49.80000305175781L60.00000190734863"]

Why isn't multiple seperators working?