Hi all, I am trying to use recursive regular expression in Perl.
I am using an example from http://www.perl.com/pub/a/2003/06/06/regexps.html. Whenever I try to execute the program, it hangs and I have to do a CNTRL-C to break it. Please let me know where I am wrong. *# cat t_r.pl* #! /usr/bin/perl use warnings; use strict; my $paren = qr/ \( [^)]+ \) /x; "Some (parenthesized) text" =~ /($paren)/; print $1; # parenthesized $paren = qr/ \( ( [^()]+ # Not parens | (??{ $paren }) # Another balanced group (not interpolated yet) )+? \) /x; print "\n"; "Some (parenthesised and (gratuitously) sub-parenthesised text" =~ /($paren)/; print $1; # parenthesized print "\n"; *# perl t_r.pl* (parenthesized) <<Control-Break>> *# perl -v* This is perl, v5.8.5 built for i386-linux-thread-multi Copyright 1987-2004, Larry Wall Perl may be copied only under the terms of either the Artistic License or the GNU General Public License, which may be found in the Perl 5 source kit. Complete documentation for Perl, including FAQ lists, should be found on this system using `man perl' or `perldoc perl'. If you have access to the Internet, point your browser at http://www.perl.com/, the Perl Home Page. *#*
