how do i replace exact phrases in c# string.replace -

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I'm trying to make sure that a list of phrases is found by them and \ n + idiom Like 

  Your name: Your age: 28   
  
  My name: Your age: 28   
 I have a file with the phrases that I replace and through the bridge and the loop. Except for few words there are 2 words to use the I phrase, where the phrase starts and ends.  
 It does not seem to work, why do anyone know?  
 Example - The string is 'name: xxxxxx' is not edited.  
  output = output. ('\ B' + "name" + "b", 'match'); By using regular expressions, accounts for any number of words with spaces:    
 
 
  system. Text. Regular Expression; Reggae Rex = New Reggae ("(? & Lt; key & gt; \\ w + (\\ b \\ s + \\ w +) *) \\ s *: \\ s * (? & Lt; value & Gt; \\ w +) "); MatchCollection MC = re.Matches ("Your name: your age: 28"); Foretach (Match M in MC) {string key = m.Groups ("key") Values; String Value = M. Group ("value"). Values; / / Is stored in a list, but I will just write to the console. WrightLine (key + ":" + value); }   
 Here's some explanation:  
     
  •  Let's say what you want to the left side of the colon (:) with a  key < / Strong>, and what's on the right - a  value .  
  •  Because these key / value pairs are at least different from space, due to this, there can be a word of value (otherwise we have ambiguity).   
     Uses groups with regular expression names so that the code can be made more readable.

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