in reply to Re^3: POD style regex for inline HTML elements
in thread POD style regex for inline HTML elements

DUDE:) http://cpansearch.perl.org/src/ABIGAIL/Regexp-Common-2013031301/Changes 
Version 2013030901 Sat Mar  9 14:51:42 CET 2013
+ Use (?-1) instead of (??{ }) for the recursive balanced pattern.
  This makes the pattern unavailable for pre-5.010 perls.

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So solution is simple, on any computer you have, get the old version, print out the pattern and save it to a file

cpanm -n http://cpan.metacpan.org/authors/id/A/AB/ABIGAIL/Regexp-Common-2011121001.tar.gz 

$ perl -MRegexp::Common -le " print $RE{balanced}{-parens=>'<>'} "
(?^:(?^:(?:\<(?:(?>[^\<\>]+)|(??{$Regexp::Common::balanced [0]}))*\>))
+)

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So to inline into above program you'd write something like 

 
use vars qw/ $re_balanced_angles /;
our $re_balanced_angles = qr{(?^:(?^:(?:\<(?:(?>[^\<\>]+)|(??{ $re_bal
+anced_angles }))*\>)))}; 
...

        m{
### no more ## \G( $allowed )( $RE{balanced}{-parens=>'<>'} )
\G( $allowed )( $re_balanced_angles )
        }gcsx and do {

[download]

Or downgrade the version of Regexp::Common you upload to your website

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Re^5: POD style regex for inline HTML elements
by Lady_Aleena (Priest) on May 16, 2014 at 22:27 UTC

    Dear Anonymous Monk, it appears this will not work in Perl 5.8.8. The ?^ returns an error too. I will have to give up on this for now, since I can't convince my webhost to upgrade their default Perl to the minimum Regexp::Common requires. Thank you for your work, I am just sorry I can't use it.

    No matter how hysterical I get, my problems are not time sensitive. So, relax, have a cookie, and a very nice day!
    Lady Aleena
[reply]
[d/l]

      Dear Anonymous Monk, it appears this will not work in Perl 5.8.8. The ?^ returns an error too.

      Well, sorry about that, I forgot about that (5.16 is my first perl in path), thats just the way it stringifies on the newer perls, you can simply ditch the ^

      With actual 5.8.8 it stringifies as 

      (?-xism:(?-xism:(?:\<(?:(?>[^\<\>]+)|(??{$Regexp::Common::balanced [0]
+}))*\>)))

      [download]

      So here is the updated file, test still pass, with actual 5.8.8 too :)

      Read more... (5 kB)
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        Will you please tell me what I am missing after I took all of the comments out? I'm still getting an infinite loop when these are nested with the error Use of uninitialized value in numeric gt (>) at files/lib/Base/HTML/Inline.pm line 32, <DATA> line 19.

        package Base::HTML::Inline;
use strict;
use warnings;
use Exporter qw(import);
our @EXPORT_OK = qw(inline);

# Written by an Anonymous Monk on PerlMonks (http://www.perlmonks.org/
+?node_id=1028699)

use Test::More qw' no_plan ';
use Regexp::Common qw/ balanced /;
use Data::Dump qw/ dd pp /;

use vars qw/ $re_balanced_angles /;

sub TRACE; sub DEBUG;
*TRACE = *DEBUG = sub { print STDERR @_,"\n" };

our $re_balanced_angles = qr{\<(?:(?>[^\<\>]+)|(??{ $re_balanced_angle
+s }))*\>}x;
 
our $allowed = join '|', qw[
A ABBR ACRONYM B BIG
CITE CODE DFN EM I KBD Q SAMP SMALL
SPAN STRONG SUB SUP TT VAR
];

sub inline {
    local $_ = $_[0];
    my $dent = $_[1] || 0;
    pos = 0;
    my $ret = "";
inlineLOOP:
    while( length > pos ){
        m{\G(\s+)}gcsx and do {
            $ret .= $1;
            next inlineLOOP;
        };
        m{\G( $allowed )( $re_balanced_angles )}gcsx and do {
            TRACE "# $dent allowed<> { $1 ( $2 ) }";
            $ret .= inline_allowed( "$1" , "$2" , $dent );
            next inlineLOOP;
        };
        m{\G([^<]+\s)}gcmx and do {
            TRACE "# $dent text { $1 }";
            $ret .= inline_text( "$1" );
            next inlineLOOP;
        };;;
        m{\G([\<\>])}gcmx and do {
            TRACE "## $dent error-stray<> { $1 } at pos(@{[pos]})";
            last inlineLOOP;
        };;;
        m{\G(\S)}gcmx and do {
            TRACE "# $dent inch-forward { $1 }";
            $ret .= inline_text( "$1" );
            next inlineLOOP;
        };;;
    }
    $ret;
}

sub inline_allowed {
    my( $tag , $stuff, $dent ) = @_;
    $stuff = $1 if $stuff =~ m{^<(.*)>$}gs;
    
    my $ret = "";
    $ret .= "<\L$tag\E" if $tag;
    
    $stuff =~ s{\|([^<>]+)$}{$ret .= " $1"; "";}gsex if defined $stuff
+ ;
    ## inline_allowed_atts($tag,$1);
    $ret .= ">" if $tag;
    
    if( defined $stuff and length $stuff and $stuff =~ m{[<>]}g ){
        $ret .= inline( $stuff , $dent+1) ; ## recurse
    } else {
        $ret .= $stuff;
    }
    
    $ret .= "</\L$tag\E>" if $tag;
    $ret;
}

sub inline_text { join'',@_ }

1;

        [download]
        No matter how hysterical I get, my problems are not time sensitive. So, relax, have a cookie, and a very nice day!
        Lady Aleena
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