postgresql - Using regex in WHERE in Postgres

Question

I currently have the the following query:

select regexp_matches(name, 'foo') from table;

How can I rewrite this so that the regex is in the where like the following (not working):

select * from table where regexp_matches(name, 'foo');

Current error message is: ERROR: argument of WHERE must be type boolean, not type text[] SQL state: 42804 Character: 29

Answer 1

Write instead:

select * from table where name ~ 'foo'

The '~' operator produces a boolean result for whether the regex matches or not rather than extracting the matching subgroups.