regex - Hierarchical path RegExp -

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I have to remove the known "level" from the hierarchical path using a regular expression; in other words, 'a / b' / X / c / d 'to' a / b / c / d 'where x could be at any level of the path.

Using Javascript as an example, I have prepared the following: 

  str = str.replace (/((:::(.+\/) ) | X (?: $ | \ / (. + $ "$$") /, "$ 1 $ 2")   
 that works properly when the root of X The root is in the middle of the road, but when X comes to the end, I can create a place later to handle those examples, but will it be possible to create a better regex matching all the cases?  
 Thank you.  
  Edit : To clarify, all the levels of the path can contain any number of characters and I am only interested in deleting a level if that x matches exactly.   
 
 Change: In the empty string  
  , see the replacement below.  
  Input   
  a / B / x / c / d x / a / b / c / da / b / c / d / x   
  output   
  a / b / c / da / b / c / da / b / c / d   
  explanation   
     
  •   \ b  x /   
  •  or     < / Li>  Li> 
  •  match  / x , if lookahead  (? = $)  can assume that the end of the string is

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