athanasia,
You use the string concatenate operator . - see perlop.

To take this further, your grep should probably be a map. You likely shouldn't be using &fun(@arg) unless you know what the & is doing. Also, for anything more complex - you probably should use a block: 

for my $thing (grep defined, @oldlist) {
    if (/(\d+-PVC_\d+)/) {
        my $item = $1;
        my $str1 = foo($item) || '';
        my $str2 = bar($item) || '';
        push @newlist, $str1 . '/' . $str2;
    }
    else {
        warn "Do not know what '$thing' is\n";
    }
}

[download]

Cheers - L~R

In reply to Re: s// with e option : evaluate, quote, evaluate by Limbic~Region
in thread s// with e option : evaluate, quote, evaluate by athanasia

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.