use strict;
use warnings;
use Data::Dump qw/pp dd/;
use Test::More;
my $wiki =
'_/one *two*/ th/ree_ null _/f*ur *five*/ six_ null _/se_ven *eight*/ nine_ *fail_';
my $expected =
'one two th/ree null f*ur five six null se_ven eight nine *fail_';
my $pre = qr/(^|\s|>)/;
my $post = qr/($|\s|<)/;
my %h = (
'*' => 'b' ,
'/' => 'i' ,
'_' => 'u' ,
);
sub tf { s{ $pre ([_*/]) (.*?) \2 (?=$post)}{$1<$h{$2}>$3$h{$2}>}xg };
$_=$wiki;
my $DBG = 0;
diag "IN <= '$wiki'\n\n" if $DBG;
for my $i (1..3) {
tf();
diag "$i: '$_'\n\n" if $DBG;
}
is($_,$expected,"repeated replace");
my $rec_level=0;
sub rec {
my ($txt) = @_;
my $DBG = 1;
diag ++$rec_level ."< $txt" if $DBG;
$txt =~
s{
$pre ([_*/]) (.*?) \2 (?=$post)
}{
my $tag = $h{$2};
"$1<$tag>" . rec($3). "$tag>"
}xge;
diag $rec_level-- . "> $txt\n" if $DBG;
return $txt;
}
my $got_rec = rec($wiki);
is($got_rec,$expected,"recursive replace");
done_testing;