问题
I want to exclude periods(.) and braces ((,)).
However, decimal numbers should be left intact
So basically if the input is
Hive supports subqueries only in the FROM clause (through Hive 0.12). The subquery has to be given a name because every table in a FROM clause must have a name. Columns in the subquery select list must have unique names.
The output should be
Hive supports subqueries only in the FROM clause through Hive 0.12 The subquery has to be given a name because every table in a FROM clause must have a name Columns in the subquery select list must have unique names
回答1:
with t as (select 'Hive supports subqueries only in the FROM clause (through Hive 0.12). The subquery has to be given a name because every table in a FROM clause must have a name. Columns in the subquery select list must have unique names.' as mycol)
select regexp_replace(mycol,'(\\d+\\.\\d+)|[.()]','$1'),'\\((.*?)\\)'
from t
Hive supports subqueries only in the FROM clause through Hive 0.12 The subquery has to be given a name because every table in a FROM clause must have a name Columns in the subquery select list must have unique names
来源：https://stackoverflow.com/questions/43791225/how-to-exclude-special-characters-in-a-string-using-regular-expressions-in-hive