keys 查找键，显示键

keys *    列出所有键，生产环境慎用
keys a*   列出a开头所有键名,与mysql like相似

127.0.0.1:6379> keys 38*
1) "38"
2) "38_acc"

127.0.0.1:6379> keys *4
1) "qpiUZ-jQR81444"
2) "44"