Node.js util.types.isRegExp() Method Last Updated : 13 Oct, 2021 Comments Improve Suggest changes Like Article Like Report The util.types.isRegExp() method of util module which is primarily designed to support the needs of Node.js own Internal APIs. It is used to check whether the passed value is a regular expression. Syntax: util.types.isRegExp( value ) Parameters: This method accepts a single parameter value which holds any value i.e instance of any module. Return value: THis method returns a Boolean value i.e true if the passed value is a regular expression otherwise returns false. Below examples illustrate the use of util.types.isRegExp() method in Node.js: Example 1: JavaScript // Node.js program to demonstrate the // util.types.isRegExp() method // It includes util module const util = require('util'); // Returns false as the passed instance // is not regular expression console.log(util.types.isRegExp(new Map())); // Returns true as the passed instance // is regular expression console.log(util.types.isRegExp(new RegExp('xyz'))); Output: false true Example 2: JavaScript // Node.js program to demonstrate the // util.types.isRegExp() method // It includes util module const util = require('util'); // Returns false as the passed instance // is not regular expression console.log(util.types.isRegExp(new Map())); // Returns true as the passed instance // is regular expression console.log(util.types.isRegExp(new RegExp('xyz'))); // Returns true as the passed instance // is regular expression console.log(util.types.isRegExp(/abc/)); // Returns false as the passed instance // is not regular expression console.log(util.types.isRegExp(new Int32Array())); // Returns true as the passed instance // is regular expression console.log(util.types.isRegExp(/ab+c/)); Output: false true true false true Reference: https://nodejs.org/api/util.html#util_util_types_isregexp_value Comment More infoAdvertise with us Next Article Node.js util.types.isRegExp() Method A akshajjuneja9 Follow Improve Article Tags : Web Technologies Node.js Node.js-util-module Similar Reads Node.js Utility Module The util module in Node.js provides a variety of utility functions that assist with tasks such as debugging, formatting, and inheritance. 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