Hive：在字符的第一个和最后一个出现之间提取字符串

Question

我有一个Hive表列，其字符串用' - '分隔，我需要在' - '的第一次和最后一次出现之间提取字符串

    +-----------------+
    | col1            |
    +-----------------+
    | abc-123-na-00-sf|
    | 123-abc-01-sd   |
    | 123-abcd-sd     |  
    +-----------------+

    Required output:

    +-----------+
    | col1      |
    +-----------+
    | 123-na-00 |
    | abc-01    |
    | abcd      |  
    +-----------+

请建议使用一些正则表达式来提取所需的输出。

由于

Answer 1

with t as (select explode(array('abc-123-na-00-sf','123-abc-01-sd','123-abcd-sd')) as str)
select  regexp_extract (str,'-(.*)-',1)
from    t
;

123-na-00
abc-01
abcd

或

with t as (select explode(array('abc-123-na-00-sf','123-abc-01-sd','123-abcd-sd')) as str)
select  regexp_extract (str,'(?<=-).*(?=-)',0)
from    t
;

123-na-00
abc-01
abcd