code: public Set<byte[]> keys(String pattern){
  		Set<byte[]> keys = null;
  		Jedis jedis = jedisPool.getResource();
  		try{
  			keys = jedis.keys(pattern.getBytes());
  		}finally{
  			jedisPool.returnResource(jedis);
  		}
  		return keys;
  	}
docs: keys
  @param regex
  @return