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Link for the Problem – Day 28: RegEx, Patterns, and Intro to Databases – Hacker Rank Solution
Day 28: RegEx, Patterns, and Intro to Databases – Hacker Rank Solution
Problem:
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
6 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
julia julia riya samantha tanya
Day 28: RegEx, Patterns, and Intro to Databases – Hacker Rank Solution
import java.util.Scanner; import java.util.regex.Matcher; import java.util.regex.Pattern; public class Day28RegExPatternsAndIntroToDatabases { public static void main(String[] args) { Scanner in = new Scanner(System.in); int N = in.nextInt(); List<String> list = new ArrayList<String>(); for (int a0 = 0; a0 < N; a0++) { String firstName = in.next(); String emailID = in.next(); String regExPattern = "[a-z].@gmail.com"; Pattern p = Pattern.compile(regExPattern); Matcher m = p.matcher(emailID); if (m.find()) { list.add(firstName); } } Collections.sort(list); for (String string : list) { System.out.println(string); } in.close(); } }