count number of occurrences in string c#

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count number of occurrences in string c# 

 First use the following namesapce
          using System.Text.RegularExpressions; 

  Use the following Regx code to count 
           string source="one two three one two one"
           int count = Regex.Matches(source, "\\b(" + Yourstring + ")\\b").Count;
  that "\\b(" is used for eliminate specal charcter.

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