Hi, I'm currently having a issue implementing a regular expression within the attrs configuration file. When i try to group entry's within a regular expression the configuration is rejected: For example: This entry works: Framed-IP-Address =~ /^172\.1[6-9]|2[0-9]|3[0-1]\.[0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5]\.[0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5]$/ This entry doesn't work: Framed-IP-Address =~ /^172\.(1[6-9]|2[0-9]|3[0-1])\.([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])\.([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])$/ Does anyone know the correct syntax for grouping a entry within a regular expression? It looks like grouping by () is not supported by freeradius? We are using the following version: freeradius: FreeRADIUS Version 2.0.4, for host i486-pc-linux-gnu, built on Sep 7 2008 at 23:35:34 Best regards, Ivo Vastert