From a32daa911e51d71b93025198f63b43db3b4ab96c Mon Sep 17 00:00:00 2001
From: Jack Smith <jasmith@hubspot.com>
Date: Tue, 18 Nov 2025 16:53:23 -0500
Subject: [PATCH] fix(eager execution): Fix bug from escaped slash right before
 quote character

---
 .../hubspot/jinjava/util/EagerExpressionResolver.java    | 7 ++++++-
 .../jinjava/util/EagerExpressionResolverTest.java        | 9 +++++++++
 2 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/src/main/java/com/hubspot/jinjava/util/EagerExpressionResolver.java b/src/main/java/com/hubspot/jinjava/util/EagerExpressionResolver.java
index cc97811ff..a2efeeebc 100644
--- a/src/main/java/com/hubspot/jinjava/util/EagerExpressionResolver.java
+++ b/src/main/java/com/hubspot/jinjava/util/EagerExpressionResolver.java
@@ -175,7 +175,12 @@ public static Set<String> findDeferredWords(
           );
           prevQuotePos = curPos;
         }
-        prevChar = c;
+        if (prevChar == '\\') {
+          // Double escapes cancel out.
+          prevChar = 0;
+        } else {
+          prevChar = c;
+        }
         curPos++;
       }
       words.addAll(
diff --git a/src/test/java/com/hubspot/jinjava/util/EagerExpressionResolverTest.java b/src/test/java/com/hubspot/jinjava/util/EagerExpressionResolverTest.java
index 21b9d2592..2e1d962cf 100644
--- a/src/test/java/com/hubspot/jinjava/util/EagerExpressionResolverTest.java
+++ b/src/test/java/com/hubspot/jinjava/util/EagerExpressionResolverTest.java
@@ -357,6 +357,15 @@ public void itHandlesSingleQuotes() {
       .isEqualTo("' & ' & '\"");
   }
 
+  @Test
+  public void itHandlesEscapedSlashBeforeQuoteProperly() {
+    EagerExpressionResult eagerExpressionResult = eagerResolveExpression(
+      "deferred|replace('\\\\', '.')"
+    );
+    assertThat(eagerExpressionResult.getDeferredWords())
+      .containsExactlyInAnyOrder("deferred", "replace.filter");
+  }
+
   @Test
   public void itHandlesNewlines() {
     context.put("foo", "\n");