import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Example {
public static void main(String[] args) {
final String regex = "(?![\\d.]+)((?!-))(xn--)?[a-z0-9][a-z0-9-_]{0,61}[a-z0-9]{0,1}\\.(xn--)?([a-z0-9\\._-]{1,61}|[a-z0-9-]{1,30})";
final String string = "www.example.com\n"
+ "subdomain.example.com\n"
+ "subdomain.example.co.uk\n\n"
+ "192.168.0.0\n"
+ "127.0.0.1\n\n"
+ "Lucia told me about www.example.com. However, whenever I visit the site the IP 127.0.0.1 shows up.";
final Pattern pattern = Pattern.compile(regex, 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