Adds info on :my; refs #1475

doc/Language/regexes.pod6

@@ -1022,8 +1022,16 @@ it in a variable first:
 
     # CORRECT: $0 is saved into a variable outside the second capture
     # before it is used inside (the `{}` is needed to update the current match)
-    say "11" ~~ /(\d) {} :my $c = $0; ($c)/;
-    # OUTPUT: «｢11｣␤ 0 => ｢1｣␤ 1 => ｢1｣␤»
+    say "11" ~~ /(\d) {} :my $c = $0; ($c)/; # OUTPUT: «｢11｣␤ 0 => ｢1｣␤ 1 => ｢1｣␤»
+    say "Matched $c"; # OUTPUT: «␤Matched 1␤»
+
+
+C<:my> helps scoping the C<$c> variable within the regex and beyond; in this case we can use it in the next sentence to show what has been matched inside the regex. This can be used for debugging inside regular expressions, for instance:
+
+    my $paragraph="line\nline2\nline3"; 
+    $paragraph ~~ rx| :my $counter = 0; ( \V* { ++$counter } ) *%% \n |;
+    say "Matched $counter lines"; # OUTPUT: «Matched 3 lines␤»
+
 
 =head2 X<Named captures|regex, Named captures>