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Close forgotten HTML tags easily in user HTML input (See related posts)

If you let users type raw HTML into your input boxes, they will inevitably forget to close some of their tags from time to time. Close any forgotten tags with this:

h1 = {}
h2 = {}
code.scan(/\<([^\>\s\/]+)[^\>\/]*?\>/).each { |t| h1[t[0]] ? h1[t[0]] += 1 : h1[t[0]] = 1 }
code.scan(/\<\/([^\>\s\/]+)[^\>]*?\>/).each { |t| h2[t[0]] ? h2[t[0]] += 1 : h2[t[0]] = 1 }
h1.each {|k,v| code += "</#{k}>" * (h1[k] - h2[k].to_i) if h2[k].to_i < v }
to ruby html by peter on Tue May 17 15:44:13 -0400 2005

Comments on this post

quilsone posts on Nov 07, 2007 at 20:42
the only problem with this is that it doesn't close the tags in the correct order, which can cause problems. without going overboard, this works a bit better:

  def close_tags(text)
    open_tags = []
    text.scan(/\<([^\>\s\/]+)[^\>\/]*?\>/).each { |t| open_tags.unshift(t) }
    text.scan(/\<\/([^\>\s\/]+)[^\>]*?\>/).each { |t| open_tags.slice!(open_tags.index(t)) }
    open_tags.each {|t| text += "</#{t}>" }
    text
  end

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