select specific part in string in payload

 

import com.sap.gateway.ip.core.customdev.util.Message

import groovy.util.XmlParser

import java.util.HashMap;

import java.util.*;

def Message processData(Message message) {

    def body = message.getBody(java.lang.String) as String;

    def refIndex = body.indexOf("REF");

    if (refIndex != -1) {

        def startIndex = Math.max(0, refIndex - 7);

        def prefix = body.substring(startIndex, refIndex);

        def modifiedPrefix = prefix.substring(0, 4) + "" + prefix.substring(6);

        def modifiedBody = body.substring(0, startIndex) + modifiedPrefix + body.substring(refIndex);

        message.setBody(modifiedBody);

    }

    return message;

}