gist: 183061


  
    
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              # if you have to do particularly gnarly XML handling, you often have to double-encode
# ampersands. Of course, ideally, you'd use CDATA sections to avoid this. But, alas,
# life ain't that easy. Here's a simple regex to enable you to replace "&amp;" with
# "&amp;amp;" unless, of course, it already IS that.
 
def double_encode_ampersads(string)
  string.gsub(/(&amp;)(?!amp;)/, "\\1amp;")
end
 
# if you are doing this at the shell to large numbers of files, just use sed:
#   `sed 's/(&amp;)(?!amp;)/\\1amp;/g'`
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