var regStr = "@prefix\\s+([^;]+);";
var globalRegex = new RegExp(regStr, "g");
var localRegex = new RegExp(regStr);

var prefixes = ["-moz-", "-webkit-", "-o-", "-ms-", ""];

module.exports = function(str) {
	var matches = str.match(globalRegex);

	if (!matches)
		return str;

	matches.forEach(function(m) {
		var cssProperty = m.match(localRegex)[1];
		var res = "";

		prefixes.forEach(function(prefix) {
			res += prefix+cssProperty+"; ";
		});
		res = res.substring(0, res.length - 1);

		str = str.replace(m, res);
	});

	return str;
}