import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Example {
public static void main(String[] args) {
final String regex = "(?P<req_ip>^.+)\\s+(?P<req_identity>.+?)\\s+(?P<req_user>.+?)\\s+\\[(?P<req_date>.+?)\\]\\s+\"(?P<req_method>.+?)\\s+(?P<req_path>.+?)\\s+(?P<req_protocoll>.+?)\"\\s+(?P<req_code>.+?)\\s+(?P<req_size>.+?)\\s+\"(?P<req_referer>.+?)\"\\s+\"(?P<req_device>.+?)\"";
final String string = "165.72.105.195 - - [11/May/2021:14:14:14 +0000] \"POST /us/en/registration.html HTTP/1.1\" 500 1676 \"https://my.domain.com/us/en/registration.html\" \"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.44 Safari/537.36 OPR/69.0.3686.7 (Edition beta)\"";
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