Day 7: Regular Expressions I in JavaScript | 10 Days Of JavaScript Solutions | HackerRank Programming Solutions [💯Correct]

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Introduction To JavaScript

JavaScript is a lightweight, cross-platform, and interpreted scripting language. It is well-known for the development of web pages, many non-browser environments also use it. JavaScript can be used for Client-side developments as well as Server-side developments. JavaScript contains a standard library of objects, like Array, Date, and Math, and a core set of language elements like operators, control structures, and statements.

Advantages of JavaScript

The merits of using JavaScript are −

• Less server interaction − You can validate user input before sending the page off to the server. This saves server traffic, which means less load on your server.
• Immediate feedback to the visitors − They don’t have to wait for a page reload to see if they have forgotten to enter something.
• Increased interactivity − You can create interfaces that react when the user hovers over them with a mouse or activates them via the keyboard.
• Richer interfaces − You can use JavaScript to include such items as drag-and-drop components and sliders to give a Rich Interface to your site visitors.

Link for the Problem – Day 7: Regular Expressions I – Hacker Rank Solution

Day 7: Regular Expressions I – Hacker Rank 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.

Day 7: Regular Expressions I – Hacker Rank Solution

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