CoCalc provides the best real-time collaborative environment for Jupyter Notebooks, LaTeX documents, and SageMath, scalable from individual users to large groups and classes!

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class Anemone::Extractors::MetaRefresh < Anemone::Extractors::Base
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  def run
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    doc.search( "//meta[@http-equiv='refresh']" ).map do |url|
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      begin
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        _, url = url['content'].split( ';', 2 )
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        next if !url
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        unquote( url.split( '=', 2 ).last )
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      rescue
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        next
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      end
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    end
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  rescue
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    nil
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  end
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  def unquote( str )
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    [ '\'', '"' ].each do |q|
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      return str[1...-1] if str.start_with?( q ) && str.end_with?( q )
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    end
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    str
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  end
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end
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