===== ISTEM =====
Solve the following programming task.

TASK: Deep Clone an Object

Write a function 'deepClone(obj)' that deeply copies a given JavaScript object or array (including nested objects, arrays and primitives) without sharing references. It must also clone Date and RegExp objects.

STARTER CODE (javascript):
function deepClone(obj) {
  // Write your code here
}

module.exports = { deepClone };


RULES:
- Keep the function name and signature EXACTLY as given.
- Return working code only. No explanations.
- Put the code in a single ``` block.
- Try to solve it first. If you genuinely cannot, write only this single
  line instead of producing faulty code: CANNOT_SOLVE

===== HAM YANIT =====
```javascript
function deepClone(obj) {
  if (obj === null || typeof obj !== 'object') {
    return obj;
  }

  if (obj instanceof Date) {
    return new Date(obj);
  }

  if (obj instanceof RegExp) {
    return new RegExp(obj);
  }

  if (Array.isArray(obj)) {
    const copy = new Array(obj.length);
    for (let i = 0; i < obj.length; i++) {
      copy[i] = deepClone(obj[i]);
    }
    return copy;
  }

  const copy = Object.create(Object.getPrototypeOf(obj));
  for (const key in obj) {
    if (obj.hasOwnProperty(key)) {
      copy[key] = deepClone(obj[key]);
    }
  }
  return copy;
}
```