regexp_matches question

I am using regexp_matches in a function like this

create or replace function test (v_string in text) returns varchar
as $$
declare
i_strings text[];
i_string text[];

i_strings := regexp_matches(v_string,E'[a-zA-Z0-9:\\s\\-\\.#%
]*:[A-Za-z0-9\\s\\-\\.#%]+','g');

-- Then I use the results
foreach i_string slice 1 in array i_strings
loop
raise notice 'row = %',i_string;
end loop;

when I run the function like this:

select test('1:Warehouse1;2:Warehouse2;');

postgresql complains:
ERROR: query "SELECT regexp_matches(v_string,E'[a-zA-Z0-9:\\s\\-\\.#%
]*:[A-Za-z0-9\\s\\-\\.#%]+','g')" returned more than one row

Why postgres is sending the ERROR?

Off course I am expecting more than one row!, that's why is in a foreach
loop in the first place.

If I run:
select regexp_matches('1:Warehouse1;2:Warehouse2;',E'[a-zA-Z0-9:\\s\\-\
\.#%]*:[A-Za-z0-9\\s\\-\\.#%]+','g');
regexp_matches
----------------
{1:Warehouse1}
{2:Warehouse2}
(2 rows)

I am doing something wrong?

Regards,