--- loncom/homework/randomlabel.pm	2003/09/08 19:08:57	1.47
+++ loncom/homework/randomlabel.pm	2003/09/08 19:17:34	1.48
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # random labelling tool
 #
-# $Id: randomlabel.pm,v 1.47 2003/09/08 19:08:57 albertel Exp $
+# $Id: randomlabel.pm,v 1.48 2003/09/08 19:17:34 albertel Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -193,6 +193,9 @@ sub start_labelgroup {
     my $name = &Apache::lonxml::get_param('name',$parstack,$safeeval);
     my $type = &Apache::lonxml::get_param('type',$parstack,$safeeval);
     $type =~tr/A-Z/a-z/;
+    if ($target ne 'modified' && ($name =~ /\W/ || $name =~ /^[0-9]/)) {
+	&Apache::lonxml::error("Only _ a-z A-Z and 0-9 are allowed in the name to a labelgroup, and the first character can not be a number.<br />");
+    }
     if ($target eq 'web' || $target eq 'tex' ||
 	$target eq 'grade' || $target eq 'answer' || $target eq 'analyze') {
 	$Apache::randomlabel::groupname=$name;