Algorithm


Hacker rank Problem Name: 10 Days of JavaScript - Day 7: Regular Expressions I

Hacker rank Problem Link: https://www.hackerrank.com/challenges/js10-regexp-1/problem?isFullScreen=true

Day 7: Regular Expressions I

 

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, 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

    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

 

Code Examples

#1 Code Example with Javascript Programming

Code - Javascript Programming


'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})
     */
    //var vowels=['a','e','i','o','u']
    //var re = RegExp(/^([aeiou]).*\1$/);
    var re = RegExp(/^([aeiou]).*\1$/);
    /*
     * Do not remove the return statement
     */
    return re;
}

Copy The Code & Try With Live Editor

Input

x
+
cmd
abcd

Output

x
+
cmd
false
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Demonstration


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