Split string only once

gistfile1.js

function splitOnce( str, sep ){
	var components	= str.split( sep ),
		result	= [];
	result[0]	= components.shift();
	result[1]	= components.join( sep );
	return result;
}

// Example
var string = 'key=value&key2=value2&key3=value3';
splitOnce( string, '=' );