title: How to keep selected set of strings and remove all the other set of strings from main string using Regex.Replace?
body: <p>I want to remove MEA1B4, WP and HIC from MEA1B4, SLI, CPR, WP, HIC using Regex.Replace and print as SLI, CPR.</p>
  <p>For example in string1, SLI, CPR, string2, string3 I always wanted to keep SLI, CPR except all the other strings.</p>
  <p>I have tried to do the above functionality using the pattern of .<em>(SLI\S</em>?CPR).* , Yet I only managed to replace the main string as SLI and couldn’t get full string as SLI, CPR</p>