NetMRI uses Ruby-style regular expressions, which are similar to perl regular expressions. When entering a regular expression in the Raw XML Editor, the Simple Rule Editor, or the Rule Logic Builder, starting the line with "/" allows you to use the "i" or "m" options for regular expressions. For example,
^banner motd my banner
will fail to match "banner motd MYBANNER" in the configuration file. For a case-sensitive match, enter instead
/^banner motd my banner/i