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How to use Regular Expression with test() method In Javascript

2. Using String.prototype.repeat() and String.prototype.startsWith()

  • Initialize a string to the variable.
  • Use the test() method to test a pattern in a string.
  • The test() method returns true if the match is found, otherwise, it returns false.

Example 1: This example checks for string geeksgeeksgeeks which is made up of the same substring, so it returns True. 

Javascript 
// Input string
let str = "geeksgeeksgeeks";

// Function to check if string is made of same substring
function check(str) {
    return /^(.+)\1+$/.test(str)
}

let ans = "String is not made up of same substrings";

if (check(str)) {
    ans = "String is made up of same substrings";
}

// Display output
console.log(ans);

Output
String is made up of same substrings

Example 2: This example checks for string geeksgeekgeeks which is not made up of the same substrings so it returns False. 

Javascript 
// Input string
let str = "geeksgeekgeeks";

// Function to check if string is made of same substring
function check(str) {
    return /^(.+)\1+$/.test(str)
}

let ans = "String is not made up of same substrings";

if (check(str)) {
    ans = "String is made up of same substrings";
}

// Display output
console.log(ans);

Output
String is not made up of same substrings

How to check a string is entirely made up of the same substring in JavaScript ?

In this article, we are given a string and the task is to determine whether the string is made up of the same substrings or not.

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1. Using Regular Expression with test() method

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2. Using String.prototype.repeat() and String.prototype.startsWith()

This approach repeats a substring until it equals the input string’s length. Then, it checks if the input string starts with this repeated substring, indicating that the string is entirely made up of the same substring....

3. Using String Rotation and Concatenation

This approach checks if the string can be found within a doubled version of itself (excluding the first and last characters). If the string is made up of the same substrings, it will appear within this modified doubled version....

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#JavaScript-DSA #JavaScript-Questions #javascript-string #JavaScript #Web Technologies

2. Using String.prototype.repeat() and String.prototype.startsWith()