[Eranga]

Do it as much as in simple way.

Code:

        String str=
            "<schemaVersion>6.2.0</schemaVersion>"+
            "<version>"+
            "<label>6.2.0.0.16</label>"+
            "<majorVersion>1.0</majorVersion>"+
            "</version>"+
            "<schedule name=\"no_schedule\">"+
            "<description>Speed</description>"+
            "</schedule>"+
            "<region name=\"no_region\">"+
            "<description>Speed is done</description>"+
            "</region>"+
            "</model>";
        
        String s = str.replace("Speed", "XXXX");
        System.out.println(s);

You have formated the original string in wrong way.