test method

The test method checks if a string contains at least one match with regular expression. If there is - true is returned, and if not - false.

Syntax

string.test(regular expression);

Let's check if there is a time in a string:

let str = '12:39';
let reg = /\d\d:\d\d/;

let res = reg.test(str);
console.log(res);

The code execution result:

true

Let's check if an entire string matches a regular expression:

let str = '12:39';
let reg = /^\d\d:\d\d$/;

let res = reg.test(str);
console.log(res);

The code execution result:

true

Let's check if the string contains only digits:

let str = '123';
let reg = /^\d+$/;

let res = reg.test(str);
console.log(res);

The code execution result:

true