Strip html from string Ruby on Rails

ActionView::Base.full_sanitizer.sanitize(html_string)

White list of tags and attributes can be specified as bellow

ActionView::Base.full_sanitizer.sanitize(html_string, :tags => %w(img br p), :attributes => %w(src style))

Above statement allows tags img, br and p and attributes src and style.

There's a strip_tags method in ActionView::Helpers::SanitizeHelper:

http://api.rubyonrails.org/classes/ActionView/Helpers/SanitizeHelper.html#method-i-strip_tags

Edit: for getting the text inside the value attribute, you could use something like Nokogiri with an Xpath expression to get that out of the string.

Yes, call this: sanitize(html_string, tags:[])

If we want to use this in model

ActionView::Base.full_sanitizer.sanitize(html_string)

which is the code in "strip_tags" method