Issue #16659 has been reported by svoop (Sven Schwyn).

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Misc #16659: Documentation on Regexp missing for absence pattern (?~pat)
https://bugs.ruby-lang.org/issues/16659

* Author: svoop (Sven Schwyn)
* Status: Open
* Priority: Normal
* Assignee: docs
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The absence pattern `(?~pat)` available since Ruby 2.4.1 is [not yet documented on `Regexp`](https://git.ruby-lang.org/ruby.git/tree/doc/regexp.rdoc) as of today. 

(Found it by coincidence reading [this article by Peter Cooper](https://medium.com/rubyinside/the-new-absent-operator-in-ruby-s-regular-expressions-7c3ef6cd0b99). 



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