* regcomp.c (noname_disable_map): add NT_ANCHOR case.

  Without this change, captured groups in anchors (look-ahead,
  look-behind, and so on) are not removed and
  unintended invalid backref error occur. [ruby-core:28235]

* regcomp.c (renumber_by_map): ditto.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@26796 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 28 insertions, 0 deletions

diff --git a/regcomp.c b/regcomp.c
index 57c02626ae..b681e669bf 100644
--- a/regcomp.c
+++ b/regcomp.c
@@ -1794,6 +1794,20 @@ noname_disable_map(Node** plink, GroupNumRemap* map, int* counter)
     }
     break;
 
+  case NT_ANCHOR:
+    {
+      AnchorNode* an = NANCHOR(node);
+      switch (an->type) {
+      case ANCHOR_PREC_READ:
+      case ANCHOR_PREC_READ_NOT:
+      case ANCHOR_LOOK_BEHIND:
+      case ANCHOR_LOOK_BEHIND_NOT:
+	r = noname_disable_map(&(an->target), map, counter);
+	break;
+      }
+    }
+    break;
+
   default:
     break;
   }
@@ -1852,6 +1866,20 @@ renumber_by_map(Node* node, GroupNumRemap* map)
     r = renumber_node_backref(node, map);
     break;
 
+  case NT_ANCHOR:
+    {
+      AnchorNode* an = NANCHOR(node);
+      switch (an->type) {
+      case ANCHOR_PREC_READ:
+      case ANCHOR_PREC_READ_NOT:
+      case ANCHOR_LOOK_BEHIND:
+      case ANCHOR_LOOK_BEHIND_NOT:
+	r = renumber_by_map(an->target, map);
+	break;
+      }
+    }
+    break;
+
   default:
     break;
   }