See the following snap code

class Class1	
{
 Class2 o = new Class2();
}
class Class2
{
 Class1 o = new Class1();
}

Answer:

Both the classes are creating objects of each other due which the object will pile up in the memory and lead to "StackOverFlowException". Below is the error image which is displayed once the memory is overused.

See the following video on regular expressions along with some practical demonstrations as follows: -

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