Check up on the return value of s///. In this case, your s/// always returns 1 (the number of substititions made in that iteration). map takes all those 1s and assigns them to @users. You need to return the changed value to map.

Also, your usage of map clobbers the value passed to map. True, it doesn't matter in this instance, but it's a bad habit. 

my @users = map { my $s = $_;              # Protect the caller.
                  chomp($s);
                  $s =~ s/^\Q$MAIL_ROOT//;
                  $s } `find ...`;         # Return the changed value.

[download]

Both List::MoreUtils and Algorithm::Loops provide a function that does this magic for you. 

use List::MoreUtils qw( apply );
my @users = apply { chomp; s/^\Q$MAIL_ROOT//; } `find ...`;

[download]
use Algorithm::Loops qw( Filter );
my @users = Filter { chomp; s/^\Q$MAIL_ROOT//; } `find ...`;

[download]

Update: I fixed your regexp.

In reply to Re: using map to replace text without using a foreach.... by ikegami
in thread using map to replace text without using a foreach.... by dark314

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.