How do you clone a regular expression?

How do you clone a regular expression in javascript?
I would like to know how to do the following:

1. Shallow clone the regex itself, not including state properties like lastIndex.
2. Deep clone the regex object, including state properties like lastIndex.

>Solution :

Shallow clone the regex itself, not including properties like lastIndex.

A regular expression consists of a pattern and flags.

const copy = new RegExp(original.source, original.flags);

Deep clone the regex object, including properties like lastIndex.

lastIndex is the only state.

const copy = new RegExp(original.source, original.flags);
copy.lastIndex = original.lastIndex;