Day 7: Regular Expressions I: 10 Days Of Javascript HackerRank Solution

Problem:-

Objective

In this challenge, we use a Regular Expression to evaluate a string. Check out the attached tutorial for more details.

Task

Complete the function in the editor below by returning a RegExp object, , that matches any string  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  is  .
• String  consists of lowercase letters only (i.e., [a-z]).

Output Format

The function must return a RegExp object that matches any string  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:-

'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();

});

function readLine() {

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})

*/

/*

* Do not remove the return statement

*/

let re = /^([aeiou]).+\1$/;

return re;

}

function main() {

const re = regexVar();

const s = readLine();

console.log(re.test(s));

}