my $text1 = qq{
<div id="aaaa">
	text tex text
<ul id="ccc">bla bla bla</ul>
	more text
</div>
};

my $text2 = qq{
<div id="aaaa">
	text text text

	more text
</div>
};

my $regex = '<div id="aaaa">(.*)<ul id="ccc">(.*)</ul>(.*)</div>';
if ( $text1 =~ /$regex/sg ) {
	warn "Text 1 found ".$1.$3;
}
if ( $text2 =~ /$regex/sg ) {
	warn "Text 2 found ".$1.$3;
}