... I wanted feed and any words or digits after ...

/d*/ matches zero or more  'd' characters, but does not match "words" (unless they're composed only of  'd' characters) and certainly not decimal digits. Perhaps you want something like  /feed[[:alnum:]]*/ 

c:\@Work\Perl\monks>perl -wMstrict -le
"for my $str (qw(
   feed feeder feed001 xfeed001x  fee fee001 xfeex --fee-- fe xxx 001
   )) {
   print qq{'$str' -> },
     $str =~ m{ feed [[:alnum:]]* }xms ? '' : 'NO', ' match';
   }
"
'feed' ->  match
'feeder' ->  match
'feed001' ->  match
'xfeed001x' ->  match
'fee' -> NO match
'fee001' -> NO match
'xfeex' -> NO match
'--fee--' -> NO match
'fe' -> NO match
'xxx' -> NO match
'001' -> NO match

[download]
Change the match pattern above to just  feed* to see the difference.

Give a man a fish:  <%-{-{-{-<

In reply to Re^5: perl system command by AnomalousMonk
in thread perl system command by cbtshare

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.