my $para = ..... # whatever.
    # so $para is ( possibly ) a multi-line parameter

    my $first_line_break = index( $para, "\n" );
    if( $first_line_break > 0 ) {
         $lastHeading = substr( $para, 0, $first_line_break );
         next;
    }

    if( $para =~ /mSOriginating/ && $para =~ /$msisdn/ ) {
           print $para;
     }