A basic filter
--------------

<!-- exec-raw cat examples/filter_authors.pl -->
    #!/usr/bin/env perl

    use warnings;
    use strict;
    use 5.10.0;

    # Extract name where given name matches "John":
    while (<>) {
      say "$2 $1" if m/^(.*)\t(Jo.*?)(\t|$)/i;
    }
<!-- end -->

<!-- exec -->

    $ ./examples/filter_authors.pl examples/authors.tsv
    John Brunner
    John Tolkien
    Jo Walton

<!-- end -->