From f4898649827ccd766a290d7e7c1b4f858797356e Mon Sep 17 00:00:00 2001
From: rudolfkoenig <>
Date: Fri, 16 Dec 2022 08:13:49 +0000
Subject: [PATCH] MQTT2_DEVICE: fix devicetopic parsing (Forum #130965)

git-svn-id: https://svn.fhem.de/fhem/trunk@26860 2b470e98-0d58-463d-a4d8-8e2adae1ed80
---
 fhem/FHEM/10_MQTT2_DEVICE.pm | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fhem/FHEM/10_MQTT2_DEVICE.pm b/fhem/FHEM/10_MQTT2_DEVICE.pm
index 1c4a4d14a..236545d37 100644
--- a/fhem/FHEM/10_MQTT2_DEVICE.pm
+++ b/fhem/FHEM/10_MQTT2_DEVICE.pm
@@ -448,8 +448,8 @@ MQTT2_DEVICE_Attr($$)
     } else {
       my ($a, $h) = parseParams($param); #126679
       foreach my $key (keys %{$h}) {
-        return "$key is not valid, must only contain a-zA-z0-9_"
-                if($key !~ m/[a-z0-9_]/);
+        return "$key is not valid, must only contain a-zA-Z0-9_"
+                if($key !~ m/^[a-zA-Z0-9_]+$/);
       }
       $hash->{".DT"} = $h;
     }