From c9f00dba0e34ceac1c8d14f70c1e1ba08039a3d8 Mon Sep 17 00:00:00 2001
From: Mark Amery <markrobertamery@gmail.com>
Date: Tue, 20 Jan 2026 12:21:07 +0000
Subject: [PATCH 1/3] Backport https://github.com/kpdecker/jsdiff/pull/647

---
 src/patch/parse.js | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/patch/parse.js b/src/patch/parse.js
index d1af8d3dc..8eb9074ec 100755
--- a/src/patch/parse.js
+++ b/src/patch/parse.js
@@ -18,9 +18,9 @@ export function parsePatch(uniDiff, options = {}) {
       }
 
       // Diff index
-      let header = (/^(?:Index:|diff(?: -r \w+)+)\s+(.+?)\s*$/).exec(line);
-      if (header) {
-        index.index = header[1];
+      let headerMatch = (/^(?:Index:|diff(?: -r \w+)+)\s+/).exec(line);
+      if (headerMatch) {
+        index.index = line.substring(headerMatch[0].length).trim();
       }
 
       i++;

From 2f5bf5eebedadc92474c70863e556f9820e31aa7 Mon Sep 17 00:00:00 2001
From: Mark Amery <markrobertamery@gmail.com>
Date: Tue, 20 Jan 2026 12:30:56 +0000
Subject: [PATCH 2/3] Backport https://github.com/kpdecker/jsdiff/pull/649

---
 src/patch/parse.js | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/src/patch/parse.js b/src/patch/parse.js
index 8eb9074ec..dfbaafb04 100755
--- a/src/patch/parse.js
+++ b/src/patch/parse.js
@@ -53,12 +53,12 @@ export function parsePatch(uniDiff, options = {}) {
   // Parses the --- and +++ headers, if none are found, no lines
   // are consumed.
   function parseFileHeader(index) {
-    const fileHeader = (/^(---|\+\+\+)\s+(.*)$/).exec(diffstr[i]);
-    if (fileHeader) {
-      let keyPrefix = fileHeader[1] === '---' ? 'old' : 'new';
-      const data = fileHeader[2].split('\t', 2);
+    const fileHeaderMatch = (/^(---|\+\+\+)\s+/).exec(diffstr[i]);
+    if (fileHeaderMatch) {
+      let keyPrefix = fileHeaderMatch[1] === '---' ? 'old' : 'new';
+      const data = diffstr[i].substring(3).trim().split('\t', 2);
       let fileName = data[0].replace(/\\\\/g, '\\');
-      if (/^".*"$/.test(fileName)) {
+      if (fileName.startsWith('"') && fileName.endsWith('"')) {
         fileName = fileName.substr(1, fileName.length - 2);
       }
       index[keyPrefix + 'FileName'] = fileName;

From e8bb42240c6adbbcdad7754f37b094081c9e7112 Mon Sep 17 00:00:00 2001
From: Mukil Elango <mukilane@gmail.com>
Date: Fri, 23 Jan 2026 09:19:43 +0000
Subject: [PATCH 3/3] v3.5.1

---
 package.json | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/package.json b/package.json
index d2376bfb6..8b6fddb28 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "diff",
-  "version": "3.5.0",
+  "version": "3.5.1",
   "description": "A javascript text diff implementation.",
   "keywords": [
     "diff",