private static String getRegexp(SedArguments args)
   {
      if (args.isRegexpSet())
      {
         return args.getRegexp();
      }
      if (args.isString1Set())
      {
         return args.getString1();
      }
      return "";
   }
private static String getRegexp ( SedArguments args ) { if ( args . isRegexpSet ( ) ) { return args . getRegexp ( ) ; } if ( args . isString1Set ( ) ) { return args . getString1 ( ) ; } return "" ; }
Returns the regexp operand from args, either called "regexp" or
"string1". If none of the two is set, an empty string is returned.

@param args
the args with operand values
@return the regexp argument from "regexp" or "string1" or an empty string
of none of the two operands is set