cat YourFile|perl -pe'$/="Title:";chomp;$_=/invalid url/?"Title:".$_:""'

##</code><code>##

pre> perl -MO=Deparse -pe'$/="Title:";chomp;$_=/invalid url/?"Title:".$_:""'
-e syntax OK
LINE: while (defined($_ = <ARGV>)) {
    $/ = 'Title:';
    chomp $_;
    $_ = /invalid url/ ? 'Title:' . $_ : ''
}
continue {
    print $_;
}