$content = '

lalala
		qwerty;
ssss
aaaa;
dddd;
xcvxcvxcvdocument.forms.auth.action="http://123.ru/au/authen.phtml?u=lalala&s=&i=0.0&a_cd=123abc";

lalala
hekihekiheki

';


print $1, ' ', $2 if $content =~ m|document\.forms\.auth\.action=\"http://123\.ru/au/authen\.phtml\?u=(.*?)\&s=\&i=0\.0\&a_cd=(.*?)\";|;