Issue #4167 has been updated by George M. Harkin.


Workaround is to use 

  exp = URI.encode(x, Regexp.new("[^#{URI::PATTERN::UNRESERVED}#{URI::PATTERN::RESERVED}#]", false, 'N'))

where x is the URL with a # symbol for an anchor tag

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http://redmine.ruby-lang.org/issues/show/4167

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