getDigits(String) 추가

src/main/java/cokr/xit/foundation/data/RegistrationNumber.java

@@ -14,11 +14,15 @@ public class RegistrationNumber extends AbstractComponent {
 
 	private static final DateFormats dateFormats = new DateFormats();
 
+	public static final String getDigits(String str) {
+        return !isEmpty(str) ? str.replaceAll("[^0-9]", "") : "";
+	}
+
 	public static final Type getType(String str) {
-		if (isEmpty(str))
+        String digits = getDigits(str);
+		if (isEmpty(digits))
 			return Type.UNKNOWN;
 
-        String digits = str.replaceAll("[^0-9]", "");
         int length = digits.length();
         if (length == 10)
 			return Type.BUSINESS;