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

import static java.util.Arrays.asList;

public class Regex2 {
    private static final String PHONE_REGEX = "(?:\\d{1,2} )?\\(?(\\d{3})\\)?([ -]?(\\d{3,4}))+";

    public static void main(String[] args) {
        Regex2 regex = new Regex2();
        regex.shouldMatchPhoneRegex();
    }

    private void shouldMatchPhoneRegex() {
        List<String> shouldMatch = asList("415-555-1234", "650-555-2345", "(416)555-3456", "202 555 4567", "4035555678", "1 416 555 9292");
        List<String> captureGroups = asList("415", "650", "416", "202", "403", "416");

        shouldMatchRegexAndCaptures(PHONE_REGEX, shouldMatch, captureGroups);
    }

    private void shouldMatchRegexAndCaptures(String regex, List<String> shouldMatch, List<String> captureGroups) {
        for (int i = 0; i < shouldMatch.size(); i++) {
            Pattern pattern = Pattern.compile(regex);
            Matcher matcher = pattern.matcher(shouldMatch.get(i));
            if (!matcher.matches()) {
                throw new IllegalStateException(shouldMatch.get(i) + " - Should match regex!");
            }
            if (!matcher.group(1).equals(captureGroups.get(i))) {
                throw new IllegalStateException(shouldMatch.get(i) + " - Should match - " + captureGroups.get(i) + " - capture group!");
            }
        }
    }
}