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

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

Day 7: Regular Expressions II



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

  • String s starts with the prefix Mr.Mrs.Ms.Dr., or Er.
  • The remainder of string s (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 s is =>3.

Output Format

The function must return a RegExp object that matches any string s 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.

Solution -Day 7: Regular Expressions II

'use strict';


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();

function readLine() {
    return inputString[currentLine++];

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])+$/;
     * Do not remove the return statement
    return re;

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

Disclaimer: The above Problem (Regular Expressions II) is generated by Hacker Rank but the Solution is Provided by CodingBroz. This tutorial is only for Educational and Learning Purpose.

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