JavaScript RegExp toString()
Syntax & Examples

RegExp.toString() method

The toString() method of the RegExp object in JavaScript returns a string representing the regular expression. This method overrides the Object.prototype.toString() method.

Syntax of RegExp.toString()

The syntax of RegExp.toString() method is:

toString()

This toString() method of RegExp returns a string representing the specified object. Overrides the Object.prototype.toString() method.

Return Type

RegExp.toString() returns value of type String.


✐ Examples

1 Using toString() to get the string representation of a RegExp

In JavaScript, we can use the toString() method to get the string representation of a regular expression.

For example,

  1. We create a RegExp object regex with the pattern /hello/i.
  2. We use the toString() method to get the string representation of regex.
  3. The result is stored in the variable str and we log it to the console.

JavaScript Program

const regex = /hello/i;
const str = regex.toString();
console.log(str);

Output

/hello/i

2 Using toString() with a global pattern

In JavaScript, we can use the toString() method to get the string representation of a regular expression with the global flag.

For example,

  1. We create a RegExp object regex with the pattern /\d+/g.
  2. We use the toString() method to get the string representation of regex.
  3. The result is stored in the variable str and we log it to the console.

JavaScript Program

const regex = /\d+/g;
const str = regex.toString();
console.log(str);

Output

/\d+/g

3 Using toString() to verify the pattern of a RegExp

In JavaScript, we can use the toString() method to verify the pattern and flags of a regular expression.

For example,

  1. We create a RegExp object regex with the pattern /abc/i.
  2. We use the toString() method to get the string representation of regex.
  3. The result is stored in the variable str and we log it to the console.
  4. We verify that the string representation includes both the pattern and the 'i' flag.

JavaScript Program

const regex = /abc/i;
const str = regex.toString();
console.log(str);

Output

/abc/i

Summary

In this JavaScript tutorial, we learned about toString() method of RegExp: the syntax and few working examples with output and detailed explanation for each example.