REGEXP_CONTAINS order and Case statement in bigquery

Question

I\'m using case statement and REGEXP_CONTAINS.Just wanted to see if the following order will give me the correct output.

 (CASE 
 WHEN REGEXP_CONTAINS(AdSet, \'(?         


        

Answer 1

Seems correct if you want case insensitive search for the keyword, while in general, string functions are more efficient than REGEX functions, consider to:

REGEXP_CONTAINS(AdSet, '(?i)BUS') THEN "BUS"

=>

STRPOS(UPPER(AdSet), 'BUS') <> 0 THEN "BUS"