rmodifier: prohibit names beginning with "#" for rmodifiers

src/plugins/rmodifier/rmodifier-command.c

@@ -242,6 +242,8 @@ rmodifier_command_init ()
                              "listdefault: list default rmodifiers\n"
                              "        add: add a rmodifier\n"
                              "       name: name of rmodifier\n"
+                             "             note: the name can not start with "
+                             "\"#\"\n"
                              "  modifiers: comma separated list of modifiers\n"
                              "     groups: action on groups found: comma separated "
                              "list of groups (from 1 to 9) with optional \"*\" "

src/plugins/rmodifier/rmodifier.c

@@ -263,9 +263,11 @@ rmodifier_new (const char *name, const char *modifiers, const char *str_regex,
     struct t_rmodifier *new_rmodifier, *ptr_rmodifier;
     regex_t *regex;
 
-    if (!name || !name[0] || !modifiers || !modifiers[0]
+    if (!name || !name[0] || (name[0] == '#') || !modifiers || !modifiers[0]
         || !str_regex || !str_regex[0])
+    {
         return NULL;
+    }
 
     regex = malloc (sizeof (*regex));
     if (!regex)