hadoop - 如何仅使用Hive中的regexp_extract函数提取标点符号

Question

我正在 hive 中学习regexp_extract函数，假设我有表'A'和列'word'为，
A word Hello! world, how are you?
我只想提取标点符号，以便输出，
! , ?
我如何尝试使用regexp_extract进行以下操作，但未获得所需的输出，
select regexp_extract(word,"[^A-Za-z0-9]*","1") from A;
请指导!

Answer 1

hive> with A as (select explode(array('word','Hello!','world,','how','are','you?')) as word)
    > select  regexp_extract(word,'\\p{Punct}',0) as Punct
    > from    A
    > ;
OK
punct

!
,


?