From 06c1a194acf488bb5c45097d7b7d345369b5b006 Mon Sep 17 00:00:00 2001
From: KanorUbu <contact@kanor.fr>
Date: Sat, 28 Oct 2023 10:19:50 +0200
Subject: [PATCH] BUG: Error when filling a value with parentheses #2268
 (#2269)

Co-authored-by: rdl <rdl@provexi.fr>
---
 pypdf/_writer.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/pypdf/_writer.py b/pypdf/_writer.py
index 51b92b0e1..8f4767415 100644
--- a/pypdf/_writer.py
+++ b/pypdf/_writer.py
@@ -920,7 +920,8 @@ def _update_text_field(self, field: DictionaryObject) -> None:
         else:  # /Tx
             txt = field.get("/V", "")
             sel = []
-
+        # Escape parentheses (pdf 1.7 reference, table 3.2  Literal Strings)
+        txt = txt.replace("\\", "\\\\").replace("(", r"\(").replace(")", r"\)")
         # Generate appearance stream
         ap_stream = f"q\n/Tx BMC \nq\n1 1 {rct.width - 1} {rct.height - 1} re\nW\nBT\n{da}\n".encode()
         for line_number, line in enumerate(txt.replace("\n", "\r").split("\r")):