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Thanks, pludi, I wrote both an email to Jeffrey Friedl, and a post on perlmonks.

Here's my answer to Perl gurus from perl.org:

===
Let's present the re

'ab' =~ /((\w+)(?{print defined $2 ?...

The regex
'ab' =~ /((\w+)(?{print defined $2 ? "\$2=$2\n" : "\$2 not defined\n"})){2}/;
outputs:
$2=ab
$2 not defined
$2=b
Why $2 not defined? I think, the regex here must print $2=a. Is it a...

Yes, 2*-3 is valid for Perl, Delphi and other compilers, but in mathematic we must write 2*(-3).

Serge

Can a Perl regexp validate arithmetic expressions? I say yes. Here is my Perl regexp to validate arifmetic expressions:

#!perl -w
use strict;
use re 'eval';

my @testexpr=(
# Valid...