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      my $str = "1\n2\n3\n4";
      my @tokens = split( /\n/, $str );
      # now tokens contain
      # ( "1", "2", "3", "4" ), NOT ( "1\n", "2\n", "3\n", "4\n" )

    my $para = ..... # whatever.
    # so $para is ( possibly ) a multi-line parameter
...
    if( $para =~ /mSOriginating/ && $para =~ /$msisdn/ ) {
           print $para;
     }