Re: where clause subqueries vs multiple rows results

I've a query which I'd have liked to word akin to:

  SELECT guid FROM child WHERE the_fkey =
         ( SELECT id FROM parent WHERE name ~ 'some_regex' )
         ORDER BY the_fkey, my_pkey;

I got around it by doing the SELECT id first, and then doing a SELECT
guid for each row returned, appending the results together.

Can that be done in a single query, insead of 1+n queries?

SELECT guid
FROM child
INNER JOIN parent ON (
    child.the_fkey = parent.id
    AND
)
WHERE name ~ 'some_regex'
ORDER BY
    child.the_fkey,
    child.my_pkey
;

I am not sure what table name is from but since you say it is n+1 queries I assume it is from the child table?  It would help to know what columns are on which tables.