include::../rule.adoc[] ifdef::env-github,rspecator-view[] ''' == Implementation Specification (visible only on this page) include::../message.adoc[] === Parameters .format **** _STRING_ ---- [a-z_][a-z0-9_]\{2,}$ ---- Regular expression used to check the function **** ''' == Comments And Links (visible only on this page) include::../comments-and-links.adoc[] endif::env-github,rspecator-view[]