It's not especially clear and it's an easy mistake to make. I've been using Perl for years and consider myself quite experienced with it, but this exact issue got me a couple of months ago. I had to read the text rendering of a bunch of records, which might or might not contain all fields from the database.

while (<TEXT>) { ($f1) = /yada.+(SpecialText)anchor/ }

[download]
worked fine when it worked, but sometimes the printout listed odd values. It was a real thump-yourself-on-the-forehead moment when I realized what was happening.

I think a quick example in perlre would help a lot of newbies, and even the occasional old-timer.

Dave

In reply to Re: Perl's POD's description of the use of capturing special variables. by marmot
in thread Perl's POD's description of the use of capturing special variables. by davido

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.