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
7
10
99
101
6
7
10
99
101

---

local p = {}

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

		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