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	6
7	7
10	10
99	99
101	101
6
7
10	10
99	99
101	101

---

local p = {}

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