if owa_pattern.match('email.address@server.com', '^.+@{1}\w+\.{1}\w{2,3}$') then
/*matches*/
else
/*not matches*/
end if;
Just create validation function returning boolean:
declare
begin
return
owa_pattern.match(:P27_EMAIL, '^.+@{1}\w+\.{1}\w{2,3}$');
end;