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Regex for sed/awk command

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I would like to change the file content which i specified like below.I want to comment out all the lines which contains ".class" except the class name i provide.

@MyClass1.MyClass2(value = {
    Class1.class,
    Class2.class,
    Class3.class,
    Class4.class
})
public class Foo {}

For example if i provide Class2 as parameter to

sed -i -E 's/some_regex/Class2/g'

command,the result should be like this,

@MyClass1.MyClass2(value = {
    //Class1.class,
    Class2.class,
    //Class3.class,
    //Class4.class
})
public class Foo {}

What regex should i use for this?


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