How to add comma to a number value ?

I just want to players see this in there cash Gui (EXEMPLE : 1,253,453)

so when they play they will not see as 1253453

the script that i made d'ont wanna execute it just not showing me comma when i add 1000 in the number value

game.Players.PlayerAdded:Connect(function(plr)
	local stats = Instance.new("Model", plr)
	stats.Name = "Leaderstats"
	local cash = Instance.new("NumberValue", stats)
	cash.Value = 0
	cash.Name = "Cash"
	
return #cash % 3 == 0 and cash:reverse():gsub("(%d%d%d)", "%1,"):reverse():sub(2) or cash:reverse():gsub("(%d%d%d)", "%1,"):reverse()

end)

You have the right idea but a bit off track...

You where correct on using gsub and such, but you where just a tiny bit off track. Heres the correct function to convert an int. :)

function format_int(number)
	local i, j, minus, int, fraction = tostring(number):find('([-]?)(%d+)([.]?%d*)')
	int = int:reverse():gsub("(%d%d%d)", "%1,")
	return minus .. int:reverse():gsub("^,", "") .. fraction
end

print(format_int(1234))
print(format_int(10000000))
print(format_int(249949))
print(format_int(-1234))

--[[ CONSOLE
	1,234
	10,000,000
	249,949
	-1,234
]]--