clone-regexp

Cloning a regular expression

This feature allows you to create a copy of an existing regular expression. The cloned regex will have the same source and flags as the original.

const cloneRegexp = require('clone-regexp');
const regex = /[a-z]/gi;
const clonedRegex = cloneRegexp(regex);
console.log(clonedRegex); // Output: /[a-z]/gi

Modifying flags

This feature allows you to clone a regular expression and modify its flags. In this example, the 'i' flag is removed, and the 'm' flag is added.

const cloneRegexp = require('clone-regexp');
const regex = /[a-z]/gi;
const clonedRegex = cloneRegexp(regex, {flags: 'gm'});
console.log(clonedRegex); // Output: /[a-z]/gm

Changing the lastIndex

This feature allows you to clone a regular expression and set the lastIndex property. This is useful when you want to reset the state of the regex for a new search.

const cloneRegexp = require('clone-regexp');
const regex = /[a-z]/gi;
regex.lastIndex = 10;
const clonedRegex = cloneRegexp(regex, {lastIndex: 0});
console.log(clonedRegex.lastIndex); // Output: 0