Day28 RegEx, Patterns, and Intro to Databases

Objective

Today, we’re working with regular expressions. Check out the Tutorial tab for learning materials and an instructional video!

Task

Consider a database table, Emails, which has the attributes First Name and Email ID. Given rows of data simulating the Emails table, print an alphabetically-ordered list of people whose email address ends in .

Input Format

The first line contains an integer, , total number of rows in the table.
Each of the subsequent lines contains space-separated strings denoting a person’s first name and email ID, respectively.

Constraints

Each of the first names consists of lower case letters only.
Each of the email IDs consists of lower case letters , and only.
The length of the first name is no longer than 20.
The length of the email ID is no longer than 50.

Output Format

Print an alphabetically-ordered list of first names for every user with a gmail account. Each name must be printed on a new line.

Sample Input

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riya riya@gmail.com
julia julia@julia.me
julia sjulia@gmail.com
julia julia@gmail.com
samantha samantha@gmail.com
tanya tanya@gmail.com
Sample Output

Sample Output

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julia
julia
riya
samantha
tanya

Solution

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function main() {
    const N = parseInt(readLine(), 10);
    const patten = new RegExp("@gmail.com");
    const names = [];

    for (let NItr = 0; NItr < N; NItr++) {
        const firstNameEmailID = readLine().split(' ');

        const firstName = firstNameEmailID[0];

        const emailID = firstNameEmailID[1];

        patten.test(emailID) && names.push(firstName);
    }

    names.sort().forEach(name => console.log(name));
}