Removes the first count occurrences of elements equal to value from the list
stored at key.
The count argument influences the operation in the following ways:
count > 0: Remove elements equal tovaluemoving from head to tail.count < 0: Remove elements equal tovaluemoving from tail to head.count = 0: Remove all elements equal tovalue.
For example, LREM list -2 "hello" will remove the last two occurrences of
"hello" in the list stored at list.
Note that non-existing keys are treated like empty lists, so when key does not
exist, the command will always return 0.
返回值
Integer reply: the number of removed elements.
例子
redis>
RPUSH mylist "hello"
(integer) 1redis> RPUSH mylist "hello"
(integer) 2redis> RPUSH mylist "foo"
(integer) 3redis> RPUSH mylist "hello"
(integer) 4redis> LREM mylist -2 "hello"
(integer) 2redis> LRANGE mylist 0 -1
1) "hello" 2) "foo"