title: Count the number of times a string appears within a string
body: <p>I simply have a string that looks something like this:</p>
  
  <p>"7,true,NA,false:67,false,NA,false:5,false,NA,false:5,false,NA,false"</p>
  
  <p>All I want to do is to count how many times the string "<strong>true</strong>" appears in that string. I'm feeling like the answer is something like <code>String.CountAllTheTimesThisStringAppearsInThatString()</code> but for some reason I just can't figure it out. Help?</p>