An improved version from http://davedash.com/2010/11/19/pythonic-string-formatting-in-javascript/

Pythonish string formatting

/* Python(ish) string formatting:
 * >>> format('{0}', ['zzz'])
 * "zzz"
 * >>> format('{x}', {x: 1})
 * "1"
*/
var format = (function() {
    var re = /\{([^}]+)\}/g;
    return function(s, args) { 
        return s.replace(re, function(_, match){ return args[match]; }); 
    }
}());