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Introduce html2text for extracting plaintext from statuses. #236.
Unlike strip_tags, html2text will preserve text present in other nodes, e.g. anchor tags: [1] pry(main)> str = '<a href="http://www.example.com">A link</a>' => "<a href=\"http://www.example.com\">A link</a>" [2] pry(main)> Html2Text.convert(str) => "[A link](http://www.example.com)" [3] pry(main)> include ActionView::Helpers::SanitizeHelper => Object [4] pry(main)> strip_tags(str) => "A link" Preserving the href of an anchor allows keyword mutes to also match on URLs, which is something that the frontend regex filter can currently do.local
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