Day 7: Regular Expressions II 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 ProblemDay 7: Regular Expressions II – Hacker Rank Solution

Day 7: Regular Expressions II – Hacker Rank Solution



Complete the function in the editor below by returning a RegExp object, , that matches any string  satisfying both of the following conditions:

  • String  starts with the prefix Mr.Mrs.Ms.Dr., or Er.
  • The remainder of string  (i.e., the rest of the string after the prefix) consists of one or more upper and/or lowercase English alphabetic letters (i.e., [a-z] and [A-Z]).


  • The length of string  is  .

Output Format

The function must return a RegExp object that matches any string  satisfying both of the given conditions.

Sample Input 0


Sample Output 0


Explanation 0

This string starts with Mr., followed by an English alphabetic letter (X).

Sample Input 1


Sample Output 1


Explanation 1

This string starts with Mrs., followed by an English alphabetic letter (Y).

Sample Input 2


Sample Output 2


Explanation 2

This string starts with Dr# instead of Dr., so it’s invalid.

Sample Input 3

Er .Abc

Sample Output 3


Explanation 3

This string starts with Er but there is a space before the period (.), making the string invalid.

Day 7: Regular Expressions II – Hacker Rank Solution
function regexVar() {
  // Declare a RegExp object variable named 're'
  // It must match a string that starts with 'Mr.', 'Mrs.', 'Ms.', 'Dr.', or 'Er.',
  // followed by one or more letters.
  let re = /^(Mr|Mrs|Ms|Dr|Er)(\.)([a-zA-Z])+$/;
  return re;

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