Java Regex Error - No group 1

Question

I ran this as a UnitTest in my project

public class RadioTest {

    private static Pattern tier;
    private static Pattern frequency;
    private static Pa         


        

Answer 1

Pattern.compile("Tier: \\d");

does not define a group so this expression matches but you can't extract a group. You'll probably want to do it like:

Pattern.compile("Tier: (\\d)");

Also for your other expressions. You'll need to () enclose parts that you want to extract as group.