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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.

Approach: Using Regular Expression with test() method

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






// 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. 






// 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


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