is-regex

What is is-regex?

The is-regex npm package is a utility for checking if a value is a regular expression. It is primarily used to determine whether a given value is an instance of a RegExp object.

What are is-regex's main functionalities?

Check if a value is a RegExp

This feature allows you to verify if a value is a regular expression by returning a boolean result. It's useful when you need to ensure that a variable contains a valid RegExp object before performing operations that are specific to regular expressions.

const isRegex = require('is-regex');

console.log(isRegex(/abc/)); // true
console.log(isRegex('abc')); // false

Other packages similar to is-regex

is-regexp

Similar to is-regex, is-regexp is a package that checks if a value is a regular expression. It provides a similar functionality but may have different implementation details or dependencies.

lodash.isregexp

This is a Lodash module to check if a value is classified as a RegExp object. While it offers similar functionality, it comes from the Lodash library which is a broader utility toolkit and might be preferred in projects already using Lodash.

README

is-regex

Is this value a JS regex? This module works cross-realm/iframe, and despite ES6 @@toStringTag.

Example

var isRegex = require('is-regex');
var assert = require('assert');

assert.notOk(isRegex(undefined));
assert.notOk(isRegex(null));
assert.notOk(isRegex(false));
assert.notOk(isRegex(true));
assert.notOk(isRegex(42));
assert.notOk(isRegex('foo'));
assert.notOk(isRegex(function () {}));
assert.notOk(isRegex([]));
assert.notOk(isRegex({}));

assert.ok(isRegex(/a/g));
assert.ok(isRegex(new RegExp('a', 'g')));

Tests

Simply clone the repo, npm install, and run npm test