redis - batch rename keys (prefix & postfix)

/**
 * 
 * This node script will rename all keys according to a given pattern.
 * 
 **/

var redisClient = redis.createClient(config.redis.port, config.redis.host),
    search  = '*something*', // will rename all keys that contains 'something'
    postfix = '.postfix',    // all keys will get the postfix '.postfix'
    prefix  = 'prefix.';     // all keys will get the prefix '.prefix'

redisClient.on('erro', function (err) {
  console.error('(redisClient) Redis Error ' + err);
});
redisClient.on('connect', function () {
  console.info('(redisClient) connected to redis server at: ' + config.redis.host + ':' + config.redis.port);
});

redisClient.keysAsync(search)
  .then(function(keys) {
    var multi = redisClient.multi();
    _.each(keys, function(key) {
      multi.rename(key, prefix+key+postfix);
    });
    return multi.execAsync();
  })
  .then(function() {
    console.log('DONE!');
  });