Srinivasan Gopal Srinivasan Gopal Hold PhD( High Voltage Engineering).More than 55 years experience in Academic and Industrial fields! Thoughnow retired, keep myself busy programming (hobby)- c++ and now pyhon! This user account status is Approved Though there are many articles about regex usage, none are this clear in explaining the concepts and usage!keep on writing… On Choose the Right Text Pattern Tool: Regex, Pregex, or Pyparsing