From 4896d6d497e88eaaae83c78d048b90707d5150ef Mon Sep 17 00:00:00 2001
From: Tobi Lutke <tobi@shopify.com>
Date: Wed, 11 Mar 2026 10:40:47 -0400
Subject: [PATCH] =?UTF-8?q?Replace=20manual=20scan=5Fcomparison=5Fop=20wit?=
 =?UTF-8?q?h=20regex=20=E2=80=94=20cleaner=20and=20avoids=20byteslice=20al?=
 =?UTF-8?q?location=20for=20op=20strings\n\nResult:=20{"status":"keep","co?=
 =?UTF-8?q?mbined=5F=C2=B5s":4007,"parse=5F=C2=B5s":2808,"render=5F=C2=B5s?=
 =?UTF-8?q?":1199,"allocations":25535}?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 lib/liquid/cursor.rb | 24 +++++-------------------
 1 file changed, 5 insertions(+), 19 deletions(-)

diff --git a/lib/liquid/cursor.rb b/lib/liquid/cursor.rb
index 71e19ccb..acd39444 100644
--- a/lib/liquid/cursor.rb
+++ b/lib/liquid/cursor.rb
@@ -212,27 +212,13 @@ module Liquid
     }.freeze
 
     # Scan a comparison operator. Returns frozen string or nil.
-    def scan_comparison_op
-      start = @ss.pos
-      b = @ss.peek_byte
-      case b
-      when 61, 33, 60, 62 # = ! < >
-        @ss.scan_byte
-        b2 = @ss.peek_byte
-        if b2 == 61 || b2 == 62 # second char of ==, !=, <=, >=, <>
-          @ss.scan_byte
-        end
-      when 99 # 'c' for contains
-        id = scan_id
-        return unless id == "contains"
+    # Regex for comparison operators
+    COMPARISON_OP_REGEX = /==|!=|<>|<=|>=|<|>|contains(?!\w)/
 
-        return COMPARISON_OPS['contains']
-      else
-        return
+    def scan_comparison_op
+      if (op = @ss.scan(COMPARISON_OP_REGEX))
+        COMPARISON_OPS[op]
       end
-      op_str = @source.byteslice(start, @ss.pos - start)
-      COMPARISON_OPS[op_str] || (@ss.pos = start
-                                 nil)
     end
 
     # ── Tag parsing helpers ─────────────────────────────────────────