regex - Replace all occurences of one word in string in python -

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I have this string: 

  "tag: tie, tag: ball, tag : Honey "  
 I want to replace the" tag "with" "so that I have:  
  tie, ball, honey   
 I think I should use re.sub but I can not write proper regular expressions.  
 How do I get it?   
 
 
 Pretty simple:  
  s = "tag: tie, tag : Ball, tag: honey "print s.replace (", "")

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