I played around with your code (well, actually I used Stephens's code for simplicity) and found a solution that amazed me: If you add 'o' to the regex operators (making it '/ego') everything works as expected. Here's my code: 
#!/usr/bin/perl -w

use strict;

print doFunc("MAIN", "B(1)+C(2)") . "\n";

sub doFunc
{
        my ($theFunc, $rem) = @_;

        my $re = &get_re($rem);
        
        $rem =~ s/(\w+)\(($re)\)/&doFunc($1,$2)/eog;

        return "func $theFunc returns <$rem>";
        
}

##      
### When we're called with the initial
### state, return "1|2". Otherwise, return
### our input, quotemeta'd.
###     
sub get_re
{
        my ($in) = @_;

        if ($in eq "B(1)+C(2)")
        {
                return '1|2';
        }
        else
        {
                return quotemeta ($in);
        }
}

exit (0);

[download]
Sorry that I can't tell you why perl is behaving like this. '/o' shouldn't change the behavior at all (at least that's what I though) and $re doesn't change either.. Maybe perl messes up the namespaces when doing recursive calls using a regex? I really don't know..

By the way: When I'm not using the '/o' operator and trying to print to STDERR just before the regex is executed my perl (5.6.1, linux 2.4.2) coredumps on me..

Regards, -octo-

In reply to Re: recursive /eg fails by flocto
in thread recursive /eg fails by I0

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.