[Java] On Email addresses validator

2007-11-06T22:20:26+00:00

Okay, guys, this is my version. I would like to point some things out. The Regex i use, i found years ago somewhere on the internet and use since than, checks a little more: TLDs can have between two and seven chars and so on.

I tried to make this more generic an implemented a method that gets a reader and a writer, so you could give it a FileReader or any other Reader.

Last but not least, i don't read this in a List and don't sort it so you could throw gigabytes of data in it without running out of memory.

hope that helps
Tim

## Java [java]

import java.io.*;
import java.util.regex.Pattern;
	
public class RefactorMyCodeEmail {
	
	private static Pattern validEmail = Pattern.compile("[\\w-]+(?:\\.[\\w-]+)*@(?:[\\w-]+\\.)+[a-zA-Z]{2,7}");

    public static void main(String[] args) throws IOException {
    	
    	FileReader in = null; 
    	FileWriter out = null;
    	
    	try {
    	
	    	in = new FileReader(new File(args[0]));
	    	out = new FileWriter(new File(args[1]));
	    	
	        filterEmailsFile(in, out);
        
		}finally{
			if(in != null) in.close();
			if(out != null) out.close();
		}
    }
    
    private static void filterEmailsFile(Reader in, Writer out) throws IOException {
        
        BufferedReader reader = new BufferedReader(in);
        BufferedWriter writer = new BufferedWriter(out);
        
        String email = null;
        while ((email = reader.readLine()) != null) {
            if(validEmail.matcher(email).matches()){
	        	writer.write(email);
	        	writer.newLine();
            }
        }
    }
}

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[Java] On Email addresses validator