/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		// your code goes here
		String ifIdentifier = "/interfaces/interface-xr/interface[interface-name='GigabitEthernet0/0/0/1']";
		        String neighborId = null;
        String extractedString = (null != ifIdentifier) ? (ifIdentifier.substring(ifIdentifier.lastIndexOf("[")+1, ifIdentifier.lastIndexOf("]"))) : null;
        String[] splitter = (null != extractedString) ? (extractedString.split("=")) : null;
        neighborId = (splitter.length >= 1) ? (splitter[1].replaceAll("'", "")) : null;
        System.out.print(neighborId);
	}
}

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