idk if this is even java anymore

import java.io.BufferedReader;
import java.io.IOException;
import java.util.InputMismatchException;
import java.util.regex.Pattern;

public class NumericBufferInput {
    //In order to use this function, pass a buffer, a String to print to the screen, and one of the lexer lambda expressions
    //within this class
    public static String applyLexerToBufferInput(BufferedReader ioStream, String printMe, LexString lexer) throws IOException {
        String abomination = null;
        boolean brrrrrramp;
        do {
            brrrrrramp = false;
            try {
                System.out.println(printMe);
                abomination = ioStream.readLine();
                lexer.lex(abomination);
            } catch (InputMismatchException e) {
                brrrrrramp = true;
            }
        } while (brrrrrramp);
        return abomination;
    }

    @FunctionalInterface
    public interface LexString {
        void lex(String s) throws InputMismatchException;
    }

    //determines if a string will parse as an Int/Long Literal that is non-octal
    public static final LexString isNaturalNumber = (String inputString) -> {
        var numberMatch = Pattern.compile("^(0|[1-9]\\d*)$").matcher(inputString);
        if (!numberMatch.find()) {
            throw new java.util.InputMismatchException();
        }
    };

    //determines if a string is Double/Float literal that is non-octal
    public static final LexString isFractional = (String amIFractional) -> {
        var fracMatch = Pattern.compile("^(0|\\d+?)\\.\\d+$").matcher(amIFractional);
        if (!fracMatch.find()) {
            throw new java.util.InputMismatchException();
        }
    };

    //determines if a string is either a Double/Float literal, or an Int/Long literal
    public static final LexString isWholeOrFractional = (String possibleNumber) -> {
        try {
            isFractional.lex(possibleNumber);
        } catch (java.util.InputMismatchException e) {
            isNaturalNumber.lex(possibleNumber);
        }
    };
}