In iOS Copied app, merges excerpts from Kindle app in markdown blockquote format

kindleExcerptMerge.js

// A clipping object is a JavaScript object that contains the following properties. Properties values may be null.
//  title       - String
//  text        - String
//  url         - String
//  saveDate    - Date

// Merge function receives an array of clipping objects and returns the merged string

function merge(clippings) {
	var footnoteString = '\n', footnoteCounter = 1, merged = clippings.reduce(function(string, clipping) {
		var stringToAppend;
		if ((clipping.text != null) && (clipping.url != null)) {
			// regex unique to the way Kindle app sends quotes
  			// allows internal "
			var match = /"(.*?)" from/g.exec(clipping.text);
    		// strip enclosing " and make md blockquote
    		clipping.text = '> ' + match[0].replace(/^"{1}/g, '').replace(/" from$/g, '');
			stringToAppend = clipping.text + '[^' + footnoteCounter + ']\n> \n';
			footnoteString += '[^' + footnoteCounter + ']: [Kindle link](' + clipping.url + ')\n';
			footnoteCounter += 1;
		}
		if (string.length == 0) {
			return stringToAppend;
		}
		return string + stringToAppend;
	}, "")
	return merged + footnoteString;
}