Cosmetic change (return a warning if regexp does not find any variable to select).

src/@dseries/subsref.m

@@ -426,7 +426,9 @@ end
 %$     t(2) = 0;
 %$ end
 %$ try
+%$     warning off all
 %$     c = ts1{'[A-Z]_1'};
+%$     warning on all
 %$     t(3) = 0;
 %$ catch
 %$     t(3) = 1;

src/utilities/variables/build_list_of_variables_with_regexp.m

@@ -31,8 +31,8 @@ list_of_variables = intersect(o_list_of_variables, matched_strings_);
 if isempty(list_of_variables)
     if wildcardparameterflag
         VariableName = strrep(VariableName, '\w*', '*');
-        disp(['dseries::extact: The wildcard expression ''' VariableName ''' did not match any variable name!'])
+        warning(['dseries::extact: The wildcard expression ''' VariableName ''' did not match any variable name!'])
     else
-        disp(['dseries::extact: The regular expression ''[' VariableName ']'' did not match any variable name!'])
+        warning(['dseries::extact: The regular expression ''[' VariableName ']'' did not match any variable name!'])
     end
 end
\ No newline at end of file