From b11b437741cfbff8f9c6874dc0d72657dccba189 Mon Sep 17 00:00:00 2001
From: r-vdp <ramses@well-founded.dev>
Date: Tue, 10 Mar 2026 13:09:05 +0100
Subject: [PATCH] opensc: fix ill-defined escape sequence in version regex

Nix warns about \. being an ill-defined escape. Use \\. to properly
escape the backslash so the regex still matches a literal dot.
---
 pkgs/by-name/op/opensc/package.nix | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pkgs/by-name/op/opensc/package.nix b/pkgs/by-name/op/opensc/package.nix
index 93f3ce21112d..8d8d27d337b8 100644
--- a/pkgs/by-name/op/opensc/package.nix
+++ b/pkgs/by-name/op/opensc/package.nix
@@ -67,7 +67,7 @@ stdenv.mkDerivation (finalAttrs: {
     "completiondir=$(out)/etc"
   ];
 
-  passthru.updateScript = nix-update-script { extraArgs = [ "--version-regex=^([0-9\.]+)$" ]; };
+  passthru.updateScript = nix-update-script { extraArgs = [ "--version-regex=^([0-9\\.]+)$" ]; };
 
   meta = {
     description = "Set of libraries and utilities to access smart cards";