regex to find email address from a String

Question

My intention is to get email address from a web page. I have the page source. I am reading the page source line by line. Now I want to get email address from the current line I am reading. This current line may or may not have email. I saw a lot of regexp examples. But most of them are for validating email address. I want to get the email address from a page source not validate. It should work as http://emailx.discoveryvip.com/ is working

Some examples input lines are :

1)<p>Send details to <a href="&#109;&#97;&#105;&#108;&#116;&#111;&#58;%72%65%62%65%6b%61%68@%68%61%63%6b%73%75%72%66%65%72.%63%6f%6d">neeraj@yopmail.com</a></p>

2)<p>Interested should send details directly to <a href="http://www.abcdef.com/abcdef/">www.abcdef.com/abcdef/</a>. Should you have any questions, please email <a href="&#109;&#97;&#105;&#108;&#116;&#111;&#58;%6a%6f%62%73@%72%65%6c%61%79.%65%64%75">neeraj@yopmail.com</a>.

3)Note :- Send your queries at  neeraj@yopmail.com  for more details call Mr. neeraj 012345678901.

I want to get neeraj@yopmail.com from examples 1,2 and 3. I am using java and I am not good in rexexp. Help me.

Answer 1

You can validate e-mail address formats as according to RFC 2822, with this:

(?:[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*|"(?:[\x01-\x08\x0b\x0c\x0e-\x1f\x21\x23-\x5b\x5d-\x7f]|\\[\x01-\x09\x0b\x0c\x0e-\x7f])*")@(?:(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?|\[(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?|[a-z0-9-]*[a-z0-9]:(?:[\x01-\x08\x0b\x0c\x0e-\x1f\x21-\x5a\x53-\x7f]|\\[\x01-\x09\x0b\x0c\x0e-\x7f])+)\])

and here's an explanation from regular-expressions.info:

This regex has two parts: the part before the @, and the part after the @. There are two alternatives for the part before the @: it can either consist of a series of letters, digits and certain symbols, including one or more dots. However, dots may not appear consecutively or at the start or end of the email address. The other alternative requires the part before the @ to be enclosed in double quotes, allowing any string of ASCII characters between the quotes. Whitespace characters, double quotes and backslashes must be escaped with backslashes.

And you can check this out here: Rubular example.

Answer 2

The correct code is

Pattern p = Pattern.compile("\\b[A-Z0-9._%+-]+@[A-Z0-9.-]+\\.[A-Z]{2,4}\\b",
    Pattern.CASE_INSENSITIVE);
Matcher matcher = p.matcher(input);
Set<String> emails = new HashSet<String>();
while(matcher.find()) {
  emails.add(matcher.group());
}

This will give the list of mail address in your long text / html input.

Answer 3

You need something like this regex:

".*(\\b[A-Z0-9._%+-]+@[A-Z0-9.-]+\\.[A-Z]{2,4}\\b).*"

When it matches, you can extract the first group and that will be your email.

String regex = ".*(\\b[A-Z0-9._%+-]+@[A-Z0-9.-]+\\.[A-Z]{2,4}\\b).*";
Pattern p = Pattern.compile(regex, Pattern.CASE_INSENSITIVE);
Matcher m = p.matcher("your text here");
if (m.matches()) {
    String email = m.group(1);
    //do somethinfg with your email
}

Answer 4

This is a simple way to extract all emails from input String using Patterns.EMAIL_ADDRESS:

    public static List<String> getEmails(@NonNull String input) {
        List<String> emails = new ArrayList<>();
        Matcher matcher = Patterns.EMAIL_ADDRESS.matcher(input);
        while (matcher.find()) {
            int matchStart = matcher.start(0);
            int matchEnd = matcher.end(0);
            emails.add(input.substring(matchStart, matchEnd));
        }
        return emails;
    }