Remove XML Declarations and Unwanted Message nodes from XML using groovy script in CPI

For the scenarios that includes XML declarations and the unwanted tags <ns0:Message>,<ns0:Message1>, <multimap:Messages> and <multimap:Message1>, we generally use the XML modifier, XSLT mapping and other pallet functions to remove them. But to remove these unwanted tags and declarations directly using a groovy script, you can use the below script.

Script:

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

def Message processData(Message message) {
    def inputXml = message.getBody(String)
    def outputXml = extractFirstChild(inputXml)
    message.setBody(outputXml)
    return message
}

def extractFirstChild(String inputXml) {
    def matcher = inputXml =~ /<ns0:Message1[^>]*>((?:.|[\r\n])*?)<\/ns0:Message1>/
    if (matcher) {
        return matcher[0][1].trim()
    } else {
        return inputXml
    }
}

Input:

 <?xml version='1.0' encoding='UTF-8'?>
    <multimap:Messages xmlns:multimap="http://sap.com/xi/XI/SplitAndMerge">
       <multimap:Message1>
         <ns0:Messages xmlns:ns0="http://sap.com/xi/XI/SplitAndMerge">
             <ns0:Message1> 
                <root> 
                   <Parent> 
                      <Child1>Value1</Child1> 
                      <Child2>Value2</Child2> 
                      <Child3>Value3</Child3> 
                      <Child4> 
                          <field1>Value4</field1> 
                          <field2>Value5</field2>
                      </Child4> 
                   </Parent> 
                </root> 
              </ns0:Message1> 
           </ns0:Messages
        ></multimap:Message1>
    </multimap:Messages> 

Output:

<root> 
   <Parent> 
       <Child1>Value1</Child1> 
       <Child2>Value2</Child2> 
       <Child3>Value3</Child3> 
       <Child4> 
           <field1>Value4</field1> 
           <field2>Value5</field2>
       </Child4> 
   </Parent> 
</root>

I hope, you will be benefitted from the above script.

Please feedback or comment below, if you find any other way of scripting to remove the tags.