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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();
}
}
