If you have Perl version 5.10 or later, this also works: 

c:\@Work\Perl\monks>perl -wMstrict -le
"use 5.010;
 ;;
 for my $s ('21112,/vol/voly,blx',  '21113,/vol/eng,blz',  '21114,/vol
+/eng,file') {
   my $t = $s;
   $t =~ s{ .* \K , }{}xms;
   print qq{'$s' -> '$t'};
   }
"
'21112,/vol/voly,blx' -> '21112,/vol/volyblx'
'21113,/vol/eng,blz' -> '21113,/vol/engblz'
'21114,/vol/eng,file' -> '21114,/vol/engfile'

[download]

Update: Slightly changed code example to enhance clarity.

Give a man a fish:  <%-{-{-{-<

In reply to Re^3: sed command in perl by AnomalousMonk
in thread sed command in perl by novice2015

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.