如何检查字符串是否为十进制/浮点数？

import re

def is_decimal(string):
    pattern = r'^[+-]?\d+$'
    return re.match(pattern, string) is not None

def is_float(string):
    pattern = r'^[+-]?\d+(\.\d+)?$'
    return re.match(pattern, string) is not None

import java.util.regex.Pattern;

public class NumberChecker {
    public static boolean isDecimal(String string) {
        String pattern = "^[+-]?\\d+$";
        return Pattern.matches(pattern, string);
    }

    public static boolean isFloat(String string) {
        String pattern = "^[+-]?\\d+(\\.\\d+)?$";
        return Pattern.matches(pattern, string);
    }
}