import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Example {
public static void main(String[] args) {
final String regex = "^((AT)(U\\d{8})|(BE)(0\\d{9})|(BG)(\\d{9,10})|(CY)(\\d{8}[LX])|(CZ)(\\d{8,10})|(DE)(\\d{9})|(DK)(\\d{8})|(EE)(\\d{9})|(EL|GR)(\\d{9})|(ES)([\\dA-Z]\\d{7}[\\dA-Z])|(FI)(\\d{8})|(FR)([\\dA-Z]{2}\\d{9})|(HU)(\\d{8})|(IE)(\\d{7}[A-Z]{2})|(IT)(\\d{11})|(LT)(\\d{9}|\\d{12})|(LU)(\\d{8})|(LV)(\\d{11})|(MT)(\\d{8})|(NL)(\\d{9}(B\\d{2}|BO2))|(PL)(\\d{10})|(PT)(\\d{9})|(RO)(\\d{2,10})|(SE)(\\d{12})|(SI)(\\d{8})|(SK)(\\d{10}))$";
final String string = "ATU12345678\n"
+ "BE0123456789\n"
+ "BG123456789\n"
+ "BG1234567890\n"
+ "CY12345678X\n"
+ "CY12345678L\n"
+ "CZ12345678\n"
+ "CZ123456789\n"
+ "CZ1234567890\n"
+ "DE123456789\n"
+ "DK12345678\n"
+ "EE123456789\n"
+ "EL123456789\n"
+ "GR123456789\n"
+ "ESX12345678\n"
+ "ES12345678X\n"
+ "ESX1234567X\n"
+ "FI12345678\n"
+ "FR12345678901\n"
+ "FRX1234567890\n"
+ "FR1X123456789\n"
+ "FRXX123456789\n"
+ "HU12345678\n"
+ "IE1234567WA\n"
+ "IE1234567FA\n"
+ "IT12345678901\n"
+ "LT123456789\n"
+ "LT123456789012\n"
+ "LU12345678\n"
+ "LV12345678901\n"
+ "MT12345678\n"
+ "NL123456789B01\n"
+ "NL123456789BO2\n"
+ "PL1234567890\n"
+ "PT123456789\n"
+ "RO1234567890\n"
+ "SE123456789012\n"
+ "SK1234567890";
final Pattern pattern = Pattern.compile(regex, Pattern.CASE_INSENSITIVE | Pattern.MULTILINE);
final Matcher matcher = pattern.matcher(string);
while (matcher.find()) {
System.out.println("Full match: " + matcher.group(0));
for (int i = 1; i <= matcher.groupCount(); i++) {
System.out.println("Group " + i + ": " + matcher.group(i));
}
}
}
}
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for Java, please visit: https://docs.oracle.com/javase/7/docs/api/java/util/regex/Pattern.html