You might want to consider using a package like HTML::Template. It allows you to place tags and loops into a file for interpolation on the fly. And it's quite safer than eval :).

For example:

template.txt 

This is the time: <!-- TMPL_VAR NAME="TIME" -->

[download]

Source: 

use HTML::Template;

my $tmpl=HTML::Template->new(filename => 'template.txt');
$tmpl->param( TIME => scalar localtime(time) );
print $tmpl->output;

[download]
And, in case you didn't realize, it doesn't actually require the source to be HTML as it removes it's own "TMPL_VAR" tags from the template when displaying.

In reply to Re: Digging interpolation deeper by mr.nick
in thread Digging interpolation deeper by DeusVult

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.