Node.js util.types.isRegExp() Method
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:
// 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:
// 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