การจับคู่ตัวอักษร

public class PatternValidation {
    public static void main(String[] args) {
        List quantities = Arrays.asList("41.49", "29.08", "15.85", "12.5x");

        for (String quantity : quantities) {
            // Check if quantity contains any digits
            boolean hasDigits = ____.____('0', '9').matchesAnyOf(quantity);
            // Look for decimal separator in quantity
            boolean hasDecimal = CharMatcher.is('.').____(quantity);
            // Detect any alphabetic characters in quantity
            boolean hasInvalidChars = CharMatcher.inRange('____', '____')
                    .or(CharMatcher.inRange('____', '____')).matchesAnyOf(quantity);

            boolean isValid = hasDigits && hasDecimal && !hasInvalidChars;
            System.out.println(quantity + " has valid characters: " + isValid);
        }
    }
}