title: Regex to pull out the string between 2 underscores
body: <p>I have a pattern of type <em>anystring_OPCtarget_anystring</em>.
  Can I get some help as how to verify if the string between the 2 underscores is of type <code>"OPC(target)"</code> and pull out the target using regex.</p>
  
  <p>Suppose if my string is: <code>MP700000001_OPC32_812345643</code>
  first, I need to verify if the string between underscores starts with <code>OPC</code> and then get the target text after <code>OPC</code> and before the 2nd underscore.</p>
  
  <p>Help appreciated!!!</p>
  
  <p>Thank you</p>