Did you mean "first and last hyphen" ? If so: 

#!/usr/bin/perl

use strict; # https://perlmonks.org/?node_id=11109157
use warnings;

my $line = 'A A Milne - Winnie-The-Pooh and Silver-Bear vol5-12 - Xi P
+ress - Peking (1998)';

print "$line\n";

$line =~ s/-\K.*(?=-)/ $& =~ tr'-'_'r /e;

print "$line\n";

[download]

Outputs: 

A A Milne - Winnie-The-Pooh and Silver-Bear vol5-12 - Xi Press - Pekin
+g (1998)
A A Milne - Winnie_The_Pooh and Silver_Bear vol5_12 _ Xi Press - Pekin
+g (1998)

[download]

If this is not what you want, how about providing several test cases along with expected output.

In reply to Re: Regex Parsing Chars in a Line by tybalt89
in thread Regex Parsing Chars in a Line by kel

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