Count the number of times a string appears within a string

Question

I simply have a string that looks something like this    7 true NA false 67 false NA false 5 false NA false 5 false NA false   All I want to do is to count how many times the string  true  appears in that string  I m feeling like the answer is something like String CountAllTheTimesThisStringAppearsInThatString   but for some reason I just can t figure it out  Help

User · Accepted Answer

Regex Matches input   true   Count

User · Answer

do this   please note that you will have to define the regex for  test      string s    7 true NA false 67 false NA false 5 false NA false 5 false NA false   string   parts    new Regex      Split s     just do a count on parts

User · Answer

Your regular expression should be  btrue b to get around the  miscontrue  issue Casper brings up  The full solution would look like this   string searchText    7 true NA false 67 false NA false 5 false NA false 5 false NA false   string regexPattern      btrue b   int numberOfTrues   Regex Matches searchText  regexPattern  Count    Make sure the System Text RegularExpressions namespace is included at the top of the file

User · Answer

With Linq     string s    7 true NA false 67 false NA false 5 false NA false 5 false NA false   var count   s Split new               Count s   gt  s     true

User · Answer

Here  I ll over-architect the answer using LINQ   Just shows that there s more than  n  ways to cook an egg   public int countTrue string data        string   splitdata   data Split            var results   from p in splitdata             where p Contains  true               select p       return results Count

User · Answer

Probably not the most efficient  but think it s a neat way to do it   class Program       static void Main string   args                Console WriteLine CountAllTheTimesThisStringAppearsInThatString  7 true NA false 67 false NA false 5 false NA false 5 false NA false    true             Console WriteLine CountAllTheTimesThisStringAppearsInThatString  7 true NA false 67 false NA false 5 false NA false 5 false NA false    false                 static Int32 CountAllTheTimesThisStringAppearsInThatString string orig  string find                var s2   orig Replace find              return  orig Length - s2 Length    find Length

User · Answer

This will fail though if the string can contain strings like  miscontrue       Regex Matches  7 true NA false 67 false NA false 5 false NA false 5 false NA false    true   Count

[c#] Count the number of times a string appears within a string

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