You're question is a little vague - but I'm guessing the problem is that you have code somewhat like the following (which i'll use as an example): 
#!/usr/bin/perl -w
 
use strict;
 
my $name = 'Alex';
my $greeting = 'Hello $name!';
 
print $greeting;

[download]
Which you want to print 'Hello Alex', but currently it's printing 'Hello $name!'.

The following code will do this, though is perhaps a little hack-ish, and some of our more experienced monks could enlighten both of us as to a more elegant method: 
#!/usr/bin/perl -w
 
use strict;
 
my $name = 'Alex';
my $greeting = 'Hello $name!';
 
$greeting =~ s|\$([\w_]+)|eval "\${$1}"|e;
 
print $greeting;

[download]

In reply to Re: How can one re-parse(?) a string to fill in variables by kilinrax
in thread How can one re-parse(?) a string to fill in variables by Anonymous Monk

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.