Hive SQL查询中Regexp_replace的异常行为 [英] Strange behaviour of Regexp_replace in a Hive SQL query

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本文介绍了Hive SQL查询中Regexp_replace的异常行为的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

我有一些输入信息,试图从输入中删除ID字符串以.0结尾的部分.0.

I have some input information where I'm trying to remove the part .0 from my input where an ID string ends with .0.

select student_id, regexp_replace(student_id, '.0','') from school_result.credit_records where student_id like '%.0';

输入:

01-0230984.03
12345098.0
34567.0

预期输出:

01-0230984.03 
12345098
34567

但是我得到的结果如下:它删除所有旁边带有0的字符,而不是仅删除以.0结尾的出现

But the result I'm getting is as follows: It's removing any character having with a 0 next to it instead of removing only the occurrences that end with .0

0129843
123498
34567

我做错了什么?有人可以帮忙吗?

What am I doing wrong? Can someone please help?

推荐答案

点在正则表达式中具有特殊含义(表示任何字符).如果您确实需要点(.),则应使用双斜杠(在Hive中)对其进行屏蔽.还要添加行尾锚($):

Dot in regexp has special meaning (it means any character). If you need dot (.) literally, it should be shielded using double-slash (in Hive). Also add end-of-the-line anchor($):

with mydata as (
select stack(3,
'01-0230984.03',
'12345098.0',
'34567.0'
) as str
)

select regexp_replace(str,'\\.0$','') from mydata;

结果:

01-0230984.03
12345098
34567

Regexp '\\.0$'字面意思是点零(),即行的结尾($).

Regexp '\\.0$' means dot zero (.0) literally, end of the line ($).

这篇关于Hive SQL查询中Regexp_replace的异常行为的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!

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