import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Example {
public static void main(String[] args) {
final String regex = "(?P<remote_addr>((?:[0-9]{1,3}\\.){3}[0-9]{1,3})) (?P<dash>\\S+) (?P<remote_user>\\S+) \\[(?P<time_local>[\\w:\\/]+\\s[+|-]\\d{4})\\] \\\"(?P<request>\\S+)\\s?(?P<path>\\S+)?\\s?(?P<protocol>\\S+)?\\\" (?P<status_code>\\d{3}|-) (?P<body_bytes_sent>\\d+|-)\\s?\\\"?(?P<http_referer>[^\\\"]*)\\\"?\\s\\\"?(?P<http_user_agent>[^\\\"]*)\\\"\\s\\\"?(?P<http_x_forwarded_for>[^\\\"]*)";
final String string = "137.184.55.175 - 137.184.55.175 [28/Jul/2022:15:10:09 +0700] \"GET /c/version.js HTTP/1.1\" 404 18868 \"lkk\" \"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.169 Safari/537.36\" \"agent\"";
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