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Write a program that scans a text file for possible e-mail addresses and writes all email address to an output file.

Addresses look like this:

someone@somewhere.net


What I have tried:

Java
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

class EmailidExtration {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String input = scanner.nextLine();
 
        Pattern pattern = Pattern.compile("([a-z0-9_.-]+)@([a-z0-9_.-]+[a-z])");
        Matcher matcher = pattern.matcher("emailtext.txt");
 
        while(matcher.find()){
            System.out.println(matcher.group());
        }
    }
}
Posted
Updated 16-Nov-20 20:52pm
v2
Comments
Patrice T 16-Nov-20 20:58pm
   
What the problem is with this code ?
Member 14994674 17-Nov-20 9:10am
   
it outputs nothing...it runs but do not return a thing
Patrice T 17-Nov-20 9:53am
   
Use Improve question to update your question.
So that everyone can pay attention to this information.

1 solution

Your code finds nothing, because your matcher is working on the filename, not the file content:
Java
Matcher matcher = pattern.matcher("emailtext.txt");
Read the file, and pass the content to the matcher instead of the filename.

And a better email Regex is:
([a-zA-Z0-9_\-\.]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([a-zA-Z0-9\-]+\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})
   

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