import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Example {
public static void main(String[] args) {
final String regex = "(?<LanguageTag>(?<langtag>(?<language>(?:[a-z]{2,3}(?<extlang>(?:\\-[a-z]{3}){0,3}))|[a-z]{4}|(?<subtag>[a-z]{5,8}))(?:\\-(?<script>[a-z]{4}))?(?:\\-(?<region>[a-z]{2}|[0-9]{3}))?(?:\\-(?<variant>[0-9a-z]{5,8}|[0-9][0-9a-z]{3}))*(?:\\-(?<extension>(?<singleton>[a-wy-z0-9])(?:\\-[0-9a-z]{2,8})+))*)|(?<privateuse>[xX](?:\\-[0-9a-z]{1,8})+)|(?<grandfathered>[a-z]{1,3}(?:\\-[0-9a-z]{2,8}){1,2}))";
final String string = "";
final Pattern pattern = Pattern.compile(regex, Pattern.MULTILINE | Pattern.CASE_INSENSITIVE);
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