[Israel.pm] recursive regex

[Yuval Yaari]

Why don't you try hacking what I started which is based on my stupid XML 
indenting script:
As you can see, it's originally written for XML parsing, but you should 
easily convert it to fit your needs.

# 8<   - - - - - - - - - - - - -   >8

#!/usr/bin/perl 
-w                                                                                                                                                    

use strict;
use diagnostics;

my @Data = <DATA>;
chomp(@Data);

my $indent_level = 0;
my @last_tags = ();

foreach my $line (@Data) {
       $line =~ s/^\s+//;
       next if (length($line) == 0);
       if ($line =~ m!BEGIN_(\w+)!) {
               print "\t" x $indent_level;
               $indent_level++;
               push(@last_tags, $1);
       } elsif ($line =~ m!END_$last_tags[-1]!) {
               $indent_level--;
               pop(@last_tags);
               print "\t" x $indent_level;
       } else {
               print "\t" x $indent_level;
       }
       print $line . "\n";
}
__DATA__
BEGIN_A
...
END_A

BEGIN_B
BEGIN_C
...
END_C
END_B
__END__

# 8<   - - - - - - - - - - - - -   >8

I could help you hack this code a bit if you want.

  --Yuval