Yet Another Way to capture first matching file, if any, and number of matching files concisely: 

c:\@Work\Perl\monks>perl -wMstrict -le
"my @files = qw(xxx  1st_CF_xx  CF__  2nd_CF_yy  CF);
 ;;
 my $n_CF_ = my ($first_CF_) = grep /_CF_/, @files;
 ;;
 print qq{number of _CF_ files: $n_CF_};
 if ($n_CF_ == 1) { print qq{just one: '$first_CF_'}; }
"
number of _CF_ files: 2

c:\@Work\Perl\monks>perl -wMstrict -le
"my @files = qw(xxx  1st_CF_xx  CF__  CF);
 ;;
 my $n_CF_ = my ($first_CF_) = grep /_CF_/, @files;
 ;;
 print qq{number of _CF_ files: $n_CF_};
 if ($n_CF_ == 1) { print qq{just one: '$first_CF_'}; }
"
number of _CF_ files: 1
just one: '1st_CF_xx'

c:\@Work\Perl\monks>perl -wMstrict -le
"my @files = qw(xxx  yyy  zzz);
 ;;
 my $n_CF_ = my ($first_CF_) = grep /_CF_/, @files;
 ;;
 print qq{number of _CF_ files: $n_CF_};
 if ($n_CF_ == 1) { print qq{just one: '$first_CF_'}; }
"
number of _CF_ files: 0

[download]

Update: Be aware that if no files match the grep condition in the example code above,  $first_CF_ is undefined.

Give a man a fish:  <%-{-{-{-<

In reply to Re^3: Setting a Variable from filename (updated) by AnomalousMonk
in thread Setting a Variable from filename by UpMaBigKilt

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.