How do you attach a TextFormatter to a TextField?

Question

I am making a simple score sheet and I'm at the phase where I want to let the user create a custom sheet. Obviously I don't want them to just put in any integer willy nilly so I'm trying to connect the UnararyOperator I created to the TextField, but I'm not sure how to do it the way my JavaFX project is set up.

public class MainMenuCtrl {
    @FXML
    private TextField playsFld;

    @FXML
    void initialize() {

        UnaryOperator<TextFormatter.Change> playsValidator = change -> {
            if (change.getText().matches("\\d{1,2,3,4,5,6}")){
                return change;
            } else {
                change.setText("");
                change.setRange(change.getRangeStart(), change.getRangeEnd());
                return change;
            }
        };
    }
}

Answer 1

It turns out regex is weird and the documentation doesn't always seem to be right. After playing around a bit I found:

"(0*(?:[1-9]?)|10)"

Means 1-10, but only 1 digit unless it is specifically 10

"^[1-6]?$"

Means 1-6 and only 1 digit

"(0*(?:[1-9][0-9]?)|100)"

Means 1-100 up to 3 digits but only a 1 in the hundreds place

*0 is match the preceding character 0 times. I'm pretty sure this is how you lock the number of digits

?: means the preceding character might not show up in the string. I think this makes it so you don't need 01.

[n-n] are for the characters searched. I'm pretty sure [1-9][0-9] in the above are 1-9 for the tens place and 0-9 for the ones. So you could add brackets for every place.

| is for matching any one element. So |100 is to match 100 exactly.

$ is to tell the computer that you have to match before the end.