– stackoverflow.com/questions/2568842/jquery-url-validator – blog.mattheworiordan.com/post/13174566389/url-regular-expression-for-links-with-or-without CREATE OR REPLACE FUNCTION
framework.check_url(email text) RETURNS bool AS $$
BEGIN
RETURN email ~* '((([A-Za-z]+:(?:\/\/)+)(?:[\-;:&=\+\$,\w]+@)?)(.)+)';
END $$ LANGUAGE plpgsql;