How do I access security code from email (web mail)?

Here you go,

If you call  getSecurityCode() then you will get return value as your security code

function test()
{
 Log.Message(getSecurityCode("<Your Message body text>"))
}

function getSecurityCode(str_EmailBody)
{
      
      var staticStringStart = "access code is ";
      var staticStringEnd = ". You will";
      
      var startPos = aqString.Find(str_EmailBody,0,false) + aqString.GetLength(staticStringStart);
      var endPos = aqString.Find(str_EmailBody,staticStringEnd,0,false);
      
      Log.Message(aqString.SubString(str_EmailBody,startPos,endPos - startPos));
      return aqString.SubString(str_EmailBody,startPos,endPos - startPos);
}