Module:StringHelpers

Module supports numbers with max 3 digits.

Tests

Simple question

Expected	Actual
150	150
15	15
7	7
150	150
15	15
7	7

Complex question

Expected	Actual
6	-1 6
7	-1 7
10	-2 10
99	-2 99
101	-3 101
6	-1 6
7	-1 7
10	-2 10
99	-2 99
101	-3 101

---

local p = {}

function p.getParagraphFromQuestion(param)
	dashIndex = string.find(param.args[1], '-', 1, true);
	if (dashIndex ~= nil) 
		then
			if (dashIndex - 3 > 0 and tonumber(string.sub(param.args[1], dashIndex - 3, dashIndex -3)))
				then
					return "-3 " .. string.sub(param.args[1], dashIndex - 3, dashIndex - 1);
			end
			if (tonumber(string.sub(param.args[1], dashIndex - 2, dashIndex -2)))
				then
					return "-2 " .. string.sub(param.args[1], dashIndex - 2, dashIndex - 1);
			end
			if (tonumber(string.sub(param.args[1], dashIndex - 1, dashIndex -1)))
				then
					return "-1 " .. string.sub(param.args[1], dashIndex - 1, dashIndex - 1);
			end
		else
			if (tonumber(string.sub(param.args[1], string.len(param.args[1]) - 2)))
				then 
					i = string.len(param.args[1]) - 2;
					return string.sub(param.args[1], i)
				end
			if (tonumber(string.sub(param.args[1], string.len(param.args[1]) - 1)))
				then 
					i = string.len(param.args[1]) - 1;
					return string.sub(param.args[1], i)
			else 
				return string.sub(param.args[1], string.len(param.args[1]))
			end
	end
end

return p