如何使用特定范围（电子邮件格式）在Java中过滤字符串

Question

I have a String in Java called Kiran<kiran@gmail.com> . I want to get String just kiran@gmail.com by removing other content.

String s1= kiran<kiran@gmail.com>

Output should be kiran@gmail.com

Please help me out in solving this.

Answer 1

If you are trying to parse email addresses, I'd recommend to use the InternetAddress class. It is part of Java EE (if you are using Java SE you need to add the javax.mail dependency).

That class is able to parse an String containing an email address like yours.

String s1 = "kiran<kiran@gmail.com>";
InternetAddress address = new InternetAddress(s1);
String email = address.getAddress();

I think this way:

• Your algorithm is automatically standards-compliant
• Your code is cleaner than using regular expressions to extract the email address.

Answer 2

You can do the following thing.

String s = "To: John Smith <john@smith.com>, Janes Smith\n"
            + "<jane@smith.org>, Tom Barter <tom@test.co.uk>, Other \n"
            + "Weird @#$@<>#^Names <other@names.me>, \n"
            + "Long Long Long Long Name <longlong@name.com>";
    s = s.substring(3); // filter TO:
    System.out.println(s);
    // Use DOTALL pattern  
    Pattern p = Pattern.compile("(.*?)<([^>]+)>\\s*,?",Pattern.DOTALL);

    Matcher m = p.matcher(s);

    while(m.find()) {
        // filter newline
        String name = m.group(1).replaceAll("[\\n\\r]+", ""); 
        String email = m.group(2).replaceAll("[\\n\\r]+", "");
        System.out.println(name + " -> " + email);
    }