Module:ReleaseYear

Documentation for this module may be created at Module:ReleaseYear/doc

-- Returns the first plausible year (1950-2039) found in a free-text date value, or an empty string.
-- Used by {{Device Infobox}} to store the numeric "Release year" property for the release timeline.
-- Citation strip markers are removed first so reference numbers can never be read as a year.
local p = {}

function p.year(frame)
	local s = frame.args[1] or ''
	s = mw.text.killMarkers(s)
	for y in s:gmatch('%f[%d](%d%d%d%d)%f[%D]') do
		local n = tonumber(y)
		if n and n >= 1950 and n <= 2039 then
			return y
		end
	end
	return ''
end

return p