javascript - error: TypeError: Cannot call method 'replace' of undefined -

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I am trying to change the substitution of each other using this code: 

 < Code> var body = 'message:' + req.query.message.replace ('/ (?: \ R \ n | \ r | \ n) / g', '

However, in this way I get this error message on the line: 

  Type error: the method is not replaced by the 'replace' I was not able to find the solution to use javascript to fix it. What I found is only related to jQuery. 
 
 How to determine any great idea, please? 
 
 
 It is saying that qqquery.message is undefined. You should know why it is undefined.

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