Index: security/src/main/org/jboss/security/auth/spi/Util.java
===================================================================
--- security/src/main/org/jboss/security/auth/spi/Util.java	(revision 57281)
+++ security/src/main/org/jboss/security/auth/spi/Util.java	(working copy)
@@ -83,7 +83,7 @@
          if( trace )
             log.trace("Checking user: "+user+", roles string: "+value);
          // See if this entry is of the form targetUser[.GroupName]=roles
-         int index = user.indexOf(roleGroupSeperator);
+         int index = user.indexOf(roleGroupSeperator, targetUser.length());
          boolean isRoleGroup = false;
          boolean userMatch = false;
          if (index > 0 && targetUser.regionMatches(0, user, 0, index) == true)