Hi Prema,

Thanks for posting the query.

For the current requirement, I think we need to write the custom java code in the initializing activity to find the delimiter that's being used in the file.  Please refer to the article method delimiter() in the java article (https://docs.oracle.com/javase/7/docs/api/java/util/Scanner.html#delimiter() ) which specifies the delimiter when a string is passed. In the current requirement, you can pass the header as the string to this and get the delimiter. Based on the condition you can set the flag condition with the true/false. If the value is true then you can proceed with the processing.

public static void main(String[] args) {

        // Initialize Scanner object         Scanner scan = new Scanner("Anna Mills/Female/18");         // initialize the string delimiter         scan.useDelimiter("/");         // Printing the delimiter used         System.out.println("The delimiter use is "+scan.delimiter());         // Printing the tokenized Strings         while(scan.hasNext()){             System.out.println(scan.next()); // If there are results then it will print otherwise the condition scan.hasNext results false, at that moment we can set the flag to false and stop the further process.         }         // closing the scanner stream         scan.close();

    }  

If you are using the file listener in Pega, then under the request tab of service file listener rule, you can configure this activity as initial activity.