diff --git a/fhem/FHEM/98_DOIF.pm b/fhem/FHEM/98_DOIF.pm
index 9e26fb909..4f602b347 100644
--- a/fhem/FHEM/98_DOIF.pm
+++ b/fhem/FHEM/98_DOIF.pm
@@ -1313,7 +1313,7 @@ sub ReadingValDoIf
         }
         DOIF_setValue_bar($hash,\%{$hash->{$bartype}{"$name $reading"}{"$num $period"}});
         return (\%{$hash->{$bartype}{"$name $reading"}{"$num $period"}});
-      } elsif ($regExp =~ /^d(\d)?/) {
+      } elsif ($regExp =~ /^d(\d)?$/) {
         my $round=$1;
         $r = ($r =~ /(-?\d+(\.\d+)?)/ ? $1 : 0);
         $r = round ($r,$round) if (defined $round); 
@@ -2291,7 +2291,7 @@ sub ReplaceReadingDoIf
             $hash->{$bartype}{"$name $reading"}{"$num $period"}{timeOffset} = (defined $timeOffset and $timeOffset ne "") ? $timeOffset : 0; 
             DOIF_setValue_bar($hash,\%{$hash->{$bartype}{"$name $reading"}{"$num $period"}},undef,1);            
           }
-        } elsif ($format =~ /^(d[^:]*)(?::(.*))?/) {
+        } elsif ($format =~ /^(d\d)(?::(.*))?/) {
           $regExp =$1;
           $output=$2;
         }else {