Incorrect pattern for area-address in isis

[nikhil2553]

pattern for area-address type defined in https://github.com/openconfig/public/blob/master/release/models/isis/openconfig-isis-types.yang seems incorrect. It is enforcing an extra dot '.' to be present in the end (eg '49.0001.').

typedef area-address { type string { pattern '^[0-9A-Fa-f]{2}.([0-9A-Fa-f]{4}.){0,3}$'; } description "This type defines the ISIS area address."; }

Couple of more questions-

1. Maximum length allowed here seems be 7 bytes instead of 13 bytes.
2. This pattern doesn't allow for even byte area-addresses (eg- 4900.1111)

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