You're close -- you need the /s modifier (see perlre) so it matches through newlines .. (note also that your /x is unnecessary in this case). Working example:

my $content = do {local $/=undef; <DATA>};

$content =~ m#cingular">(.+?)<\/font>\s*<\/b><br>(.+?)<\/p>#si;

use Data::Dumper;
print Dumper [$1, $2];

__DATA__
cingular">text to match here </font> </b><br>
<br>
all of this stuff
no matter what BR tags or whatever is found
should be matched


</p>
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