Hello, Trying to do IPv6 in Syntax Highlighting for FortiOS. As I wanted to have a different font color for the dots and the colons in the IP address, I use those as operators, and have 0-9 A-F (Uppercase A-F) as keywords set to prefix. This only works if you’re building configs though, and will go back to default if there are lower case a-f hex values if you do a copy/paste type of thing in NPP. I chose to opt for uppercase A-F since all FortiOS words are case sensitive and must be lowercase(Not strings/objects mind you). You can, while configuring the device, set IPv6 addresses with these uppercase hex values. Note: You can specify objects without string delimiters, but I find that to be bad form. And if you include grep filtering in NPP, these keywords could be exposed. Keywords List Group Prefix Mode: Checked 0 1 2 3 4 5 6 7 8 9 A B C D E F Operators 1 . : /