public/subjects/java/piscine/RegexReplace/README.md

RegexReplace

Instructions

Create a file RegexReplace.java.

Write a function removeUnits that returns the string where the units cm and € are removed if they follow directly a number and followed by a space. Write a function obfuscateEmail that returns a string where parts of email addresses are replaced by '*' if they follow the rules below:

• Hide from the username any character next to -, . or _ if they exist. Otherwise, hide 3 characters from the username if its length > 3
• If the remaining part after @ is in the format @<third level domain>.<second level domain>.<top level domain>, then hide the third and top level domains, otherwise hide the second level domain and the top level domain if it is not included in .com, .org and .net.

Expected Functions

public class RegexReplace {
    public static String removeUnits(String s) {
        // your code here
    }
    
    public static String obfuscateEmail(String s) {
        // your code here
    }
}

Usage

Here is a possible ExerciseRunner.java to test your function

import java.io.IOException;

public class ExerciseRunner {
    public static void main(String[] args) throws IOException {
        System.out.println(RegexReplace.removeUnits("32cm et 50€"));
        System.out.println(RegexReplace.removeUnits("32 cm et 50 €"));
        System.out.println(RegexReplace.removeUnits("32cms et 50€!"));
        
        System.out.println(RegexReplace.obfuscateEmail("john.doe@example.com"));
        System.out.println(RegexReplace.obfuscateEmail("jann@example.co.org"));
        System.out.println(RegexReplace.obfuscateEmail("jackob@example.fr"));
    }
}

and its output :

$ javac *.java -d build
$ java -cp build ExerciseRunner 
32 et 50
32 cm et 50 €
32cms et 50€!
l lapin jou à la bel ball avec d animau rigolo pour gagner l bill bleu
joh****@*******.com
jan*@*******.co.***
jac***@*******.**
$ 

Notions

Pattern