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

import static java.util.Arrays.asList;
import static java.util.Collections.singletonList;

public class Regex1 {
    private static final String NUMBER_REGEX = "^-?[\\d\\.e,]*$";

    public static void main(String[] args) {
        Regex1 regex = new Regex1();
        regex.shouldMatchNumberRegex();
    }

    private void shouldMatchNumberRegex() {
        List<String> shouldMatch = asList("3.14529", "-255.34", "128", "1.9e10", "123,340.00");
        List<String> shouldNotMatch = singletonList("720p");

        for (String s : shouldMatch) {
            Pattern pattern = Pattern.compile(NUMBER_REGEX);
            if (!pattern.matcher(s).matches()) {
                throw new IllegalStateException("Should match regex!");
            }
        }

        for (String s : shouldNotMatch) {
            Pattern pattern = Pattern.compile(NUMBER_REGEX);
            if (pattern.matcher(s).matches()) {
                throw new IllegalStateException("Should not match regex!");
            }
        }
    }
}