Hi folks,

This seems like it should be simple, but I've been struggling with it for a while now. I want to use a regex to substitute a variable declaration in a paragraph with it's value. If I have text like:

my $text = "Your child #child_name# is invited to come to our school. +Your child's teacher will be #teacher_name#, and the class is held in + room #room_number.";

Then I should be able to do something like (I know this is not correct!):
$text =~ s/\#\w+\#/$hash{$&}/g)

Which would result in rows like: Your child Peter is invited...

I know there is a way to do this, but it seems like I have to do two substitutions here - one to substitute #variable_name# to variable_name, then variable_name to $hash{variable_name}. But I can't for the life of me find an example that does this (substitutions within substitutions). Regex's have always kinda stymied me. I did want to solve this with a regex - I'd rather not have to use split, or other methods (which I guess I could). But any example would be helpful.

Thanks for any help!


In reply to regex substitution by michellem

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.