# Day 7: Regular Expressions I | 10 Days Of JavaScript | HackerRank Solution

Hello coders, today we are going to solve Day 7: Regular Expressions I HackerRank Solution which is a part of 10 Days of JavaScript Series.

## Objective

In this challenge, we use a Regular Expression to evaluate a string.

Complete the function in the editor below by returning a RegExp object, re, that matches any string s that begins and ends with the same vowel. Recall that the English vowels are `a``e``i``o`, and `u`.

## Constraints

• The length of string s is =>3 .
• String s consists of lowercase letters only (i.e., `[a-z]`).

## Output Format

The function must return a RegExp object that matches any string s beginning with and ending in the same vowel.

Sample Input 0

``bcd``

Sample Output 0

`false`

Explanation 0

This string starts with (and ends in) a consonant, so it cannot start and end with the same vowel.

Sample Input 1

`abcd`

Sample Output 1

`false`

Explanation 1

This string ends in a consonant, so it cannot start and end with the same vowel.

Sample Input 2

`abcda`

Sample Output 2

`true`

Explanation 2

This string starts and ends with the same vowel (`a`).

Sample Input 3

`abcdo`

Sample Output 3

`false`

Explanation 3

This string starts with the vowel `a` but ends in the vowel `o`.

## Solution – Day 7: Regular Expressions I

```'use strict';

process.stdin.resume();
process.stdin.setEncoding('utf-8');

let inputString = '';
let currentLine = 0;

process.stdin.on('data', inputStdin => {
inputString += inputStdin;
});

process.stdin.on('end', _ => {
inputString = inputString.trim().split('\n').map(string => {
return string.trim();
});

main();
});

return inputString[currentLine++];
}

function regexVar() {
/*
* Declare a RegExp object variable named 're'
* It must match a string that starts and ends with the same vowel (i.e., {a, e, i, o, u})
*/
var re = RegExp(/^([aeiou]).*\1\$/);
/*
* Do not remove the return statement
*/
return re;
}

function main() {
const re = regexVar();