c# - Replace entire text with XXX using RegEx -

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How can convert entire text to XXX using C # in regx? This will change the number of x which will be equal to the length of the string.

For example xxxxx

has the original text apple XX

with high XXXXXX

with cricket > outstanding With XXXXXXXXXXX 

  string mytext = "apple"; // I get regexp to get string output = "xxxxx" for the following line; // Apple will replace with 5x x because without the apple Long = 5    
 
 
 without regex:  
  string S = "The original text for example is replacing the apple"; Var ChangeWord = "Apple"; Var s2 = s.Replace (replaceWord, new string ('X', replaceWord.Length));   
 The new string ('X', replaceWord.Length) creates a string with 'X' characters with the same string as  replaceWord .

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