Template:Title year/doc

Usage
or

TemplateData
{	"params": { "1": {			"aliases": [ "match" ],			"label": "Match Instance", "description": "If multiple 4-digit numbers are found, this specifies which match to return, where the first match is match= 1. If a negative number is specified then a match is returned counting from the last match. Hence match = -1 is the same as requesting the last match. Defaults to 1.", "type": "number", "default": "1" },		"2": {			"aliases": [ "nomatch" ],			"label": "No match text", "description": "If no 4-digit year is found, output the \"nomatch\" value. Defaults to blank.", "type": "string" },		"page": { "label": "Override page title", "description": "Specified a page title to use other than the current page. If left blank, the template will use the title of the current page", "type": "wiki-page-name", "default": "" }	},	"description": "Extracts a 4-digit year from the current page title. All parameters are optional." }