The attempt number three is still invalid. Try it with my $repl = '$1-$1-'; The attempt four fails if the replacement contains a doublequote.

#my $repl = '$1-$1-';
use strict;
use warnings;


#my $repl = '$1';
my $repl = '$1"{$1-';
{
    print "attempt 1 ";
    my $str = "a,A,c,d";
    $str =~ s/([a-z]),/$repl/ig;
    print "yields: $str\n";
}

{
    no strict 'refs';
    print "attempt 2 ";
    my $str = "a,A,c,d";
    $str =~ s/([a-z]),/$$repl/ig;
    print "yields: $str\n";
}

{
    print "attempt 3 ";
    my $str = "a,A,c,d";
    $str =~ s/([a-z]),/eval "$repl"/ieg;
    print "yields: $str\n";
}


my $code = 'sub {$_[0] =~ s/([a-z]),/'. $repl . '/ig}';
my $re = eval ($code);
if ($@) { print "attempt 4 failed: $@" }
else {
    print "attempt 4 ";
    my $str = "a,A,c,d";
    $re->($str);
    print "yields: $str\n";
}

{
    print "attempt 5 ";
    (my $repl = $repl) =~ s/"/\\"/g;
    my $str = "a,A,c,d";
    $str =~ s/([a-z]),/qq{"$repl"}/igee;
    print "yields: $str\n";
}

[download]

Jenda
Support Denmark!
Defend the free world!

In reply to Re: Dynamically generating the replacement part of a substitution by Jenda
in thread Dynamically generating the replacement part of a substitution by chaos_cat

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.