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Jul 24th, 2017
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  1. text <- "http://x.co/imag/xyz.png,http://x.co/imag/xyz.png,http://x.co/imag/xyz.png,http://x.co/imag/jpg.png"
  2.  
  3. expected <- "http://x.co/imag/xyz.png,http://x.co/imag/jpg.png"
  4.  
  5. gsub("(^[\w|.|:|\/]*),\1+", "\1", text)
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