hive之regexp_replace函数、split函数的正则

Hive中，regexp_replace函数的第2个参数是正则表达式，第3个参数是字符串

split函数解析也是正则

因此上面如果写成这样：

 select split(regexp_replace(data,'\\},\\{','}||{'),'||')[0]as test #这里做了修改

from

(select '[{"source":"7fresh","monthSales":4900,"userCount":1900,"score":"9.9"},{"source":"jd","monthSales":2090,"userCount":78981,"score":"9.8"},{"source":"jdmart","monthSales":6987,"userCount":1600,"score":"9.0"}]'

as data) a

就得不到想要的结果了

参考自：转义字符\（在hive+shell以及java中注意事项）：正则表达式的转义字符为双斜线,split函数解析也是正则_longshenlmj的博客-CSDN博客_hive split 转义

常用的

select size(split(
regexp_replace(
    regexp_replace(get_json_object(data_map, '$.data_map'), '\\}\\,\\{','\\}\\;\\{')
                    ,'\\]|\\[','')
                            ,'\\;')) as split1_size
    from xxx.xxx_table
where pt ='2021-02-01'
limit 1000

切分之后看数组长度