How to find triple args with string.sub()?

you could add up the amount of characters from the command prefix to the player name, so you can use string.sub() to sub the string in that amount.

local message = "!givecash EXpodo1234ALT 1000" -- lets say this is the message

local totalsub = 11 -- 11 since the prefix is 11 characters
local players = {"EXpodo1234ALT"} -- maybe just say this was the array that :GetPlayers() returned
local subprefix = string.sub(message,totalsub)

for i,v in pairs(players) do
	if string.match(subprefix,v) then --  if it finds the plr name inside the string
		local amount = string.len(v) -- gets the amount of characters in the name 
		
		totalsub = totalsub + (amount+1) -- adds it up
		break -- breaks the loop
	end
end

local AmountOfMoney = string.sub(message,totalsub,100)

print(AmountOfMoney) -- prints "1000"
workspace.NumberValue.Value = workspace.NumberValue.Value + AmountOfMoney -- example

also why I did (amount+1) is because theres a space between the name and amount.

##Finished Script

game.Players.PlayerAdded:Connect(function(player)
	player.Chatted:Connect(function(message)
		if string.match(message,"!givecash ") then
			local totalsub = 11
			local players = game.Players:GetPlayers()
			local subprefix = string.sub(message,totalsub)
			
			for i,v in pairs(players) do
				if string.match(subprefix,v.Name) then
					local amount = string.len(v.Name)
					
					totalsub = totalsub + (amount+1)
					local amountofmoney = string.sub(message,totalsub,100)
					
					v.leaderstats.Cash.Value = v.leaderstats.Cash.Value + amountofmoney -- if you had a leaderstats called "Cash"
					break
				end
			end
		end
	end)
end)

######sorry if the comments made it hard to read