Using Regular Expressions to Extract a Value in Java

Question

I have several strings in the rough form:

[some text] [some number] [some more text]

I want to extract the text in [some number] using the

Answer 1

This function collect all matching sequences from string. In this example it takes all email addresses from string.

static final String EMAIL_PATTERN = "[_A-Za-z0-9-\\+]+(\\.[_A-Za-z0-9-]+)*@"
        + "[A-Za-z0-9-]+(\\.[A-Za-z0-9]+)*(\\.[A-Za-z]{2,})";

public List getAllEmails(String message) {      
    List result = null;
    Matcher matcher = Pattern.compile(EMAIL_PATTERN).matcher(message);

    if (matcher.find()) {
        result = new ArrayList();
        result.add(matcher.group());

        while (matcher.find()) {
            result.add(matcher.group());
        }
    }

    return result;
}

For message = "adf@gmail.com, >>> lalala@aaa.pl" it will create List of 3 elements.