From b734d61a039c0fa297aff600d51cb043a4e2c866 Mon Sep 17 00:00:00 2001
From: Aadhavan Srinivasan <aadhavan@twomorecents.org>
Date: Thu, 30 Jan 2025 12:27:22 -0500
Subject: [PATCH] Throw error if \B is used in character class

---
 regex/postfixNode.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/regex/postfixNode.go b/regex/postfixNode.go
index 355bc6c..a6a3cd8 100644
--- a/regex/postfixNode.go
+++ b/regex/postfixNode.go
@@ -95,6 +95,9 @@ func newEscapedNode(c rune, inCharClass bool) (postfixNode, error) {
 			toReturn.nodetype = assertionNode
 			toReturn.contents = append(toReturn.contents, c)
 		}
+		if c == 'B' && inCharClass { // Invalid
+			return postfixNode{}, fmt.Errorf("word boundaries are not allowed in character class")
+		}
 	case 'n': // Newline character
 		toReturn.nodetype = characterNode
 		toReturn.contents = append(toReturn.contents, '\n')