Does BigQuery support regular expressions flags?

Question

I want to do a case insensitive REGEX_MATCH and I'm not sure if I can use flags.

Answer 1

BigQuery uses re2 for regular expressions, and re2 does support flags.

For example, to do a case insensitive match:

SELECT REGEXP_MATCH('TomatoPotato', r'TOpo')
false

SELECT REGEXP_MATCH('TomatoPotato', r'(?:TOpo)')
false

SELECT REGEXP_MATCH('TomatoPotato', r'(?i:TOpo)')
true