Here's another option:

use strict;
use warnings;

my $dir     = shift;
my $IDs     = join '|', map { /(.+)/; "\Q$1\E" } <>;
my @results = grep /$IDs/, <$dir/*>;
print "$_\n" for @results;

[download]

Usage: perl script.pl '/the/dir/to/scan' indexDS.txt [>outFile]

The target directory is (implicitly) shifted off @ARGV and saved for later. The first <> notation reads the index file. map takes each line from the file, and the regex in it matches all characters except the newline. The captured line is surrounded by \Q ... \E to quote any meta-characters in the ID. The results, e.g., "\Q$1\E", are joined with the alternation symbol |, effectively creating an "or" type regex that's used in the grep. A file glob's used to read the directory files and only those names which contain one of the IDs are passed to @results.

Hope this helps!

In reply to Re: Looking up elements of an array in another array! by Kenosis
in thread Looking up elements of an array in another array! by better

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.