merge two regular expressions

Question

I have two regular expressions, one pulling out usernames from a csv string, and the other pulling out emails.

the string format is like this:

String         


        

Answer 1

The following code will extract your pairs. The regex is quite short, but I am almost sure, there is a more elegant way (there always is with regex!). ;)

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

public class Main {

    public static void main(String[] args) {
        String s = "name1 lastname1 (user1); name2 lastname2 (username2) <mail2@mail.something.dk>; name3 lastname3 (username3) <mail3@mail.something.dk>;";

        Pattern pattern = Pattern.compile("\\(([^\\)]+)\\)\\s<([^>]+)>");
        Matcher matcher = pattern.matcher(s);

        while (matcher.find()) {
            System.out.println(matcher.group(1) + " " + matcher.group(2));
        }
    }
}

Output:

username2 mail2@mail.something.dk
username3 mail3@mail.something.dk

Explanation for the regex "\\(([^\\)]+)\\)\\s<([^>]+)>":

• \\(([^\\)]+)\\): A group of non-) characters enclosed by ( and )
• \\s: A space in between
• <([^>]+)>: A group of non-> characters enclosed by < and >

Answer 2

You can just use an Pipe (|) in between your multiple Regex, to match all of them : -

    String s = "name lastname (username) <mail@mail.something.dk>; name lastname
            (username) <mail@mail.something.dk>; name lastname 
            (username) <mail@mail.something.dk>;";

    // Matches (?<=\\()[^\\)]+  or  ((?<=<)[^>]+)
    Pattern pattern = Pattern.compile("(?<=\\()[^\\)]+|((?<=<)[^>]+)");
    Matcher matcher = pattern.matcher(s);

    while (matcher.find()) {
        System.out.println(matcher.group());
    }

OUTPUT: -

username
mail@mail.something.dk
username
mail@mail.something.dk
username
mail@mail.something.dk

UPDATE: -

If you want to print username and email only when they both exists, then you need to split your string on ; and then apply the below Regex on each of them.

Here's the code: -

    String s = "name lastname (username) ; 
                name lastname (username) <mail@mail.something.dk>; 
                name lastname (username) <mail@mail.something.dk>;";

    String [] strArr = s.split(";");

    for (String str: strArr) {

        Pattern pattern = Pattern.compile("\\(([^\\)]+)(?:\\))\\s(?:\\<)((?<=<)[^>]+)");
        Matcher matcher = pattern.matcher(str);

        while (matcher.find()) {
            System.out.print(matcher.group(1) + " " + matcher.group(2));
        }
        System.out.println();
    }

OUTPUT: -

username mail@mail.something.dk
username mail@mail.something.dk // Only the last two have both username and email