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Re: Blog: YANG Really Takes Off in the Industry

2014-12-09 11:03:48
The expression that controls the permissible format of IPv6 addresses in
yang-types is of this ilk.
"       type string {
         pattern '((:|[0-9a-fA-F]{0,4}):)([0-9a-fA-F]{0,4}:){0,5}'
               + '((([0-9a-fA-F]{0,4}:)?(:|[0-9a-fA-F]{0,4}))|'
               + '(((25[0-5]|2[0-4][0-9]|[01]?[0-9]?[0-9])\.){3}'
               + '(25[0-5]|2[0-4][0-9]|[01]?[0-9]?[0-9])))'
               + '(/(([0-9])|([0-9]{2})|(1[0-1][0-9])|(12[0-8])))';
         pattern '(([^:]+:){6}(([^:]+:[^:]+)|(.*\..*)))|'
               + '((([^:]+:)*[^:]+)?::(([^:]+:)*[^:]+)?)'
               + '(/.+)'; "

when the bsi botched modula-2 standardisation and destroyed the language [0],
professor wirth pinned to his wall the a4 page it took them to describe the
null statement.

this piece of dystopian beauty is worthy of a wall.

randy

--

[0] http://www.scifac.ru.ac.za/cspt/sc22wg13.htm