--- loncom/lonnet/perl/lonnet.pm	2009/01/05 16:29:24	1.976.2.6
+++ loncom/lonnet/perl/lonnet.pm	2009/03/20 21:18:26	1.976.2.7
@@ -1,7 +1,7 @@
 # The LearningOnline Network
 # TCP networking package
 #
-# $Id: lonnet.pm,v 1.976.2.6 2009/01/05 16:29:24 raeburn Exp $
+# $Id: lonnet.pm,v 1.976.2.7 2009/03/20 21:18:26 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -522,7 +522,7 @@ sub appenv {
 # ----------------------------------------------------- Delete from Environment
 
 sub delenv {
-    my $delthis=shift;
+    my ($delthis,$regexp) = @_;
     if (($delthis=~/user\.role/) || ($delthis=~/user\.priv/)) {
         &logthis("<font color=\"blue\">WARNING: ".
                 "Attempt to delete from environment ".$delthis);
@@ -535,10 +535,17 @@ sub delenv {
 	tie(my %disk_env,'GDBM_File',$env{'user.environment'},
 	    (&GDBM_WRITER()|&GDBM_NOLOCK()),0640)) {
 	foreach my $key (keys(%disk_env)) {
-	    if ($key=~/^\Q$delthis\E/) { 
-		delete($env{$key});
-		delete($disk_env{$key});
-	    }
+            if ($regexp) {
+                if ($key=~/^$delthis/) {
+                    delete($env{$key});
+                    delete($disk_env{$key});
+                }
+            } else {
+                if ($key=~/^\Q$delthis\E/) {
+                    delete($env{$key});
+                    delete($disk_env{$key});
+                }
+            }
 	}
 	untie(%disk_env);
     }
@@ -9228,9 +9235,11 @@ in the user's environment.db and in %env
 
 =item *
 X<delenv()>
-B<delenv($regexp)>: removes all items from the session
-environment file that matches the regular expression in $regexp. The
-values are also delted from the current processes %env.
+B<delenv($delthis,$regexp)>: removes all items from the session
+environment file that begin with $delthis. If the
+optional second arg - $regexp - is true, $delthis is treated as a
+regular expression, otherwise \Q$delthis\E is used.
+The values are also deleted from the current processes %env.
 
 =item * get_env_multiple($name)