Apply Mask to Java back-end

Question

Does anyone know how to include a mask from a regex in a string? For example, I own the following regexString pattern = "\\d{2}[/]\\d{3}.\\d{3}[/]\\d{4}";and a variable with the following value String numeroProcesso = "010000012018";. I want a function that returns me the following result: numeroProcessoComRegex = "01/000.001/2018". This would be simple if my regex were not dynamic, but the same can be changed the Pattern at any time.

Answer 1

One way to solve your problem would be by using the Maskformatter class.

Example:

    public static void main(String[] args) {
        String pattern = "##/###.###/####";
        String numeroProcesso = "010000012018";
        System.out.println(format(pattern, numeroProcesso));
    }

    private static String format(String pattern, Object value) {
        MaskFormatter mask;
        try {
            mask = new MaskFormatter(pattern);
            mask.setValueContainsLiteralCharacters(false);
            return mask.valueToString(value);
        } catch (ParseException e) {
            throw new RuntimeException(e);
        }
    }

Imports:

    import javax.swing.text.MaskFormatter;
    import java.text.ParseException;