fix: qr() emits hex escapes for \N{NAME} portability

lib/Regexp/Parser/Objects.pm

@@ -324,6 +324,14 @@
       vis => $vis,
     }, $class;
   }
+
+  sub qr {
+    my $self = shift;
+    if ($self->{vis} =~ /^\\N\{/) {
+      return sprintf("\\x{%X}", ord($self->{data}));
+    }
+    $self->visual;
+  }
 }
 
 
@@ -615,6 +623,21 @@
     join "", @{ $self->{vis} };
   }
 
+  sub qr {
+    my $self = shift;
+    my @parts;
+    for my $i (0 .. $#{$self->{vis}}) {
+      if ($self->{vis}[$i] =~ /^\\N\{/) {
+        # \N{NAME} must be resolved by the lexer — emit hex escape for portability
+        push @parts, sprintf("\\x{%X}", ord($self->{data}[$i]));
+      }
+      else {
+        push @parts, $self->{vis}[$i];
+      }
+    }
+    join "", @parts;
+  }
+
   sub type {
     my $self = shift;
     $self->{flags} & $self->{rx}->FLAG_i ? "exactf" : "exact";

t/99misc.t

@@ -8,7 +8,7 @@
 use strict;
 use warnings;
 
-use Test::More tests => 4;
+use Test::More tests => 10;
 
 use Regexp::Parser;
 
@@ -25,3 +25,24 @@ ok( $r->root->[0]->data, "r" );
 $r = Regexp::Parser->new('[[:alpha:]]');
 is($r->visual(), '[[:alpha:]]', "[[:alpha:]]");
 
+# qr() portability: \N{NAME} should emit hex escapes, not \N{NAME} form
+# (Perl's regex engine requires \N{NAME} to be resolved by the lexer,
+# so runtime-compiled qr// patterns must use a portable representation)
+$r = Regexp::Parser->new;
+$r->regex('\N{LATIN SMALL LETTER A}');
+my $qr_str = $r->root->[0]->qr;
+like($qr_str, qr/\\x\{61\}/i, 'qr() for \\N{NAME} emits hex escape');
+unlike($qr_str, qr/\\N\{/, 'qr() for \\N{NAME} does not emit \\N{NAME}');
+
+# Verify the qr// actually compiles and matches
+my $qr = eval { $r->qr };
+ok(!$@, 'qr() with \\N{NAME} compiles without error');
+ok('a' =~ $qr, 'qr() with \\N{NAME} matches correctly');
+
+# \N{NAME} inside character class
+$r = Regexp::Parser->new;
+$r->regex('[\N{LATIN SMALL LETTER B}]');
+my $cc_qr = eval { $r->qr };
+ok(!$@, 'qr() with \\N{NAME} in char class compiles');
+ok('b' =~ $cc_qr, 'qr() with \\N{NAME} in char class matches');
+