Although my go-to XML module is XML::LibXML, XML::Twig is useful for filtering XML files. The following produces your expected output for the given input:
use warnings;
use strict;
use XML::Twig;
use XML::XPath; # for findnodes
my $filename = 'foo.xml';
XML::Twig->new(
twig_print_outside_roots => 1,
keep_spaces => 1,
twig_roots => {
'/TestCode/TestCategory/Test' => sub {
my ($t, $elt) = @_;
if ( $elt->{att}{name} =~ /^CheckType_/ ) {
my @values = $elt->findnodes('./context/value');
# could theoretically also use XPath for the following
if ( grep { $_->text =~ /XYZ/ } @values )
{ $t->flush }
else { $t->purge }
}
else { $t->purge }
},
},
)->parsefile($filename);
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