Using a regular expression with either ^ OR $ breaks the regular expression match logic.

[navaneethyv]

Consider the following pattern.

 typedef system-id {
   type string {
     pattern
       '^[0-9A-Fa-f]{4}\.[0-9A-Fa-f]{4}\.[0-9A-Fa-f]{4}';
   }
 }

It has only ^ at the beginning.

clixon> set system-id 1111.1111.1111
CLI syntax error: "set system-id 1111.1111.1111": regexp match fail: 1111.1111.1111 does not match ^[0-9A-Fa-f]{4}.[0-9A-Fa-f]{4}.[0-9A-Fa-f]{4}

Even though it is a valid regular expression match. Was working in 4.3 version.

Workaround is either both ^ $ should be given or without both of them.