From 71e22e6a8422ac0d2368817a300f54595af20735 Mon Sep 17 00:00:00 2001
From: Tobi Lutke <tobi@shopify.com>
Date: Wed, 11 Mar 2026 10:42:07 -0400
Subject: [PATCH] =?UTF-8?q?Replace=20manual=20scan=5Fdotted=5Fid=20with=20?=
 =?UTF-8?q?regex\n\nResult:=20{"status":"keep","combined=5F=C2=B5s":4121,"?=
 =?UTF-8?q?parse=5F=C2=B5s":2812,"render=5F=C2=B5s":1309,"allocations":255?=
 =?UTF-8?q?35}?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 lib/liquid/cursor.rb | 15 ++++-----------
 1 file changed, 4 insertions(+), 11 deletions(-)

diff --git a/lib/liquid/cursor.rb b/lib/liquid/cursor.rb
index 8e2ccc48..b0ef7aa5 100644
--- a/lib/liquid/cursor.rb
+++ b/lib/liquid/cursor.rb
@@ -162,21 +162,14 @@ module Liquid
       @ss.scan(QUOTED_STRING_RAW)
     end
 
+    # Regex for dotted identifier: name(.name)*
+    DOTTED_ID_REGEX = /[a-zA-Z_][\w-]*\??(?:\.[a-zA-Z_][\w-]*\??)*/
+
     # ── Expressions ─────────────────────────────────────────────────
     # Scan a simple variable lookup: name(.name)* — no brackets, no filters
     # Returns the string or nil
     def scan_dotted_id
-      start = @ss.pos
-      return unless scan_id
-
-      while @ss.peek_byte == DOT
-        @ss.scan_byte
-        unless scan_id
-          @ss.pos -= 1 # rewind the dot
-          break
-        end
-      end
-      @source.byteslice(start, @ss.pos - start)
+      @ss.scan(DOTTED_ID_REGEX)
     end
 
     # Skip a fragment without allocating. Returns length skipped, or 0.