How Do I Find Utf Entity Within A String

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C#

VS2010

Kindly suggest me a effective way to search for UTF-8 Entities within a String. How do i make a pattern or Regex which can search UTF Entities in a text file.

I am using following code for searching in C#.net using MatchCollection :

string utfmatter = "REGEX PATTHERN";
MatchCollection matchCollection_utfmatter = Regex.Matches(text, utfmatter);

In above code text is a variable which contains a set of Strings and utfmatter is the variable in which i am storing the required regex pattern.