diff --git a/nixos/modules/services/networking/kresd.nix b/nixos/modules/services/networking/kresd.nix
index 4131ff8be5d0..d7208354d4a7 100644
--- a/nixos/modules/services/networking/kresd.nix
+++ b/nixos/modules/services/networking/kresd.nix
@@ -8,9 +8,9 @@ let
   # Convert systemd-style address specification to kresd config line(s).
   # On Nix level we don't attempt to precisely validate the address specifications.
   mkListen = kind: addr: let
-    al_v4 = builtins.match "([0-9.]\+):([0-9]\+)" addr;
-    al_v6 = builtins.match "\\[(.\+)]:([0-9]\+)" addr;
-    al_portOnly = builtins.match "()([0-9]\+)" addr;
+    al_v4 = builtins.match "([0-9.]+):([0-9]+)" addr;
+    al_v6 = builtins.match "\\[(.+)]:([0-9]+)" addr;
+    al_portOnly = builtins.match "()([0-9]+)" addr;
     al = findFirst (a: a != null)
       (throw "services.kresd.*: incorrect address specification '${addr}'")
       [ al_v4 al_v6 al_portOnly ];
diff --git a/nixos/modules/services/web-apps/dokuwiki.nix b/nixos/modules/services/web-apps/dokuwiki.nix
index 9567223ebc7b..1ce584c6a46d 100644
--- a/nixos/modules/services/web-apps/dokuwiki.nix
+++ b/nixos/modules/services/web-apps/dokuwiki.nix
@@ -329,7 +329,7 @@ in
           extraConfig = "internal;";
         };
 
-        locations."~ ^/lib.*\.(js|css|gif|png|ico|jpg|jpeg)$" = {
+        locations."~ ^/lib.*\\.(js|css|gif|png|ico|jpg|jpeg)$" = {
           extraConfig = "expires 365d;";
         };
 
@@ -349,7 +349,7 @@ in
           '';
         };
 
-        locations."~ \.php$" = {
+        locations."~ \\.php$" = {
           extraConfig = ''
               try_files $uri $uri/ /doku.php;
               include ${pkgs.nginx}/conf/fastcgi_params;
diff --git a/nixos/tests/php/fpm.nix b/nixos/tests/php/fpm.nix
index f84394ccea45..02ea51794749 100644
--- a/nixos/tests/php/fpm.nix
+++ b/nixos/tests/php/fpm.nix
@@ -10,7 +10,7 @@ import ../make-test-python.nix ({pkgs, lib, php, ...}: {
         testdir = pkgs.writeTextDir "web/index.php" "<?php phpinfo();";
       in {
         root = "${testdir}/web";
-        locations."~ \.php$".extraConfig = ''
+        locations."~ \\.php$".extraConfig = ''
           fastcgi_pass unix:${config.services.phpfpm.pools.foobar.socket};
           fastcgi_index index.php;
           include ${pkgs.nginx}/conf/fastcgi_params;
diff --git a/pkgs/build-support/build-bazel-package/default.nix b/pkgs/build-support/build-bazel-package/default.nix
index 3be72bd22c3f..988298ac72bf 100644
--- a/pkgs/build-support/build-bazel-package/default.nix
+++ b/pkgs/build-support/build-bazel-package/default.nix
@@ -108,8 +108,8 @@ in stdenv.mkDerivation (fBuildAttrs // {
       rm -rf $bazelOut/external/{bazel_tools,\@bazel_tools.marker}
       ${if removeRulesCC then "rm -rf $bazelOut/external/{rules_cc,\\@rules_cc.marker}" else ""}
       rm -rf $bazelOut/external/{embedded_jdk,\@embedded_jdk.marker}
-      ${if removeLocalConfigCc then "rm -rf $bazelOut/external/{local_config_cc,\@local_config_cc.marker}" else ""}
-      ${if removeLocal then "rm -rf $bazelOut/external/{local_*,\@local_*.marker}" else ""}
+      ${if removeLocalConfigCc then "rm -rf $bazelOut/external/{local_config_cc,\\@local_config_cc.marker}" else ""}
+      ${if removeLocal then "rm -rf $bazelOut/external/{local_*,\\@local_*.marker}" else ""}
 
       # Clear markers
       find $bazelOut/external -name '@*\.marker' -exec sh -c 'echo > {}' \;
diff --git a/pkgs/development/libraries/libcutl/default.nix b/pkgs/development/libraries/libcutl/default.nix
index 7a5c39849291..ed6aae0f3083 100644
--- a/pkgs/development/libraries/libcutl/default.nix
+++ b/pkgs/development/libraries/libcutl/default.nix
@@ -18,7 +18,7 @@ stdenv.mkDerivation rec {
     license = licenses.mit;
   };
 
-  majmin = builtins.head ( builtins.match "([[:digit:]]\.[[:digit:]]+)\.*" "${version}" );
+  majmin = builtins.head ( builtins.match "([[:digit:]]\\.[[:digit:]]+).*" "${version}" );
   src = fetchurl {
     url = "https://codesynthesis.com/download/${pname}/${majmin}/${pname}-${version}.tar.bz2";
     sha256 = "070j2x02m4gm1fn7gnymrkbdxflgzxwl7m96aryv8wp3f3366l8j";