regexp_extract in hive giving error

问题

I have some data in table e.g.:

id,params  
123,utm_content=doit|utm_source=direct|   
234,utm_content=polo|utm_source=AndroidNew|

desired data using regexp_extract:

id,channel,content
123,direct,doit
234,AndroidNew,polo

Query used:

Select id, REGEXP_extract(lower(params),'(.*utm_source=)([^\|]*)(\|*)',2) as channel, REGEXP_extract(lower(params),'(.*utm_content=)([^\|]*)(\|*)',2)  as content from table;

It is showing error '* dangling meta character' and returning error code 2

Can someone help here please??

回答1:

Note that in hive, you need to double the backslashes.

Your regex should look like

(.*utm_content=)([^|]*)(\\|*)

来源：https://stackoverflow.com/questions/34836782/regexp-extract-in-hive-giving-error