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.

Task

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]).

Constraints

• 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

Mr.X

Sample Output 0

true

Explanation 0

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

Sample Input 1

Mrs.Y

Sample Output 1

true

Explanation 1

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

Sample Input 2

Dr#Joseph

Sample Output 2

false

Explanation 2

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

Sample Input 3

Er .Abc

Sample Output 3

false

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';

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 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();
    
    console.log(!!s.match(re));
}

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.