import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Example {
public static void main(String[] args) {
final String regex = "^((?P<mode>[^:]+):\\s)?in:(?P<InputInterface>[^,]+)\\s+out:(?P<OutputInterface>[^,]+),\\sconnection-state:(?P<ConnectionState>[^\\s]+)\\s+(?:src-mac\\s+(?P<SourceMacAddress>[^,]+),\\s+)?proto\\s+(?P<Protocol>\\w+)(?:\\s+\\((?P<Flags>[^)]+)\\))?,\\s+\\[?(?P<SourceAddress>\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}|[a-f\\d:]+)\\]?(?::(?P<SourcePort>\\d+))?->\\[?(?P<DestinationAddress>\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}|[a-f\\d:]+)\\]?(?::(?P<DestinationPort>\\d+))?,\\s(NAT\\s?\\[?(?P<NatSourceAddress>\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}|[a-f\\d:]+)\\]?(?::(?P<NatSourcePort>\\d+))?->\\(\\[?(?P<NatExternalAddress>\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}|[a-f\\d:]+)\\]?(?::(?P<NatExternalPort>\\d+))?->\\[?(?P<NatInternalAddress>\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}|[a-f\\d:]+)\\]?(?::(?P<NatInternalPort>\\d+))?\\),\\s)?len\\s+(?P<Length>\\d+)";
final String string = "srcnat: in:(unknown 0) out:fbox, connection-state:new proto UDP, 82.62.133.323:123->224.0.1.1:123, len 96\n"
+ "srcnat: in:Interco out:WAN, connection-state:new src-mac 00:0c:49:16:06:aa, proto UDP, 10.1.40.1:59306->8.8.4.4:53, len 82\n"
+ "srcnat: in:Interco out:fbox, connection-state:new src-mac 00:0c:49:16:06:aa, proto ICMP (type 128, code 0), 2a0c:c621:151::2->2a0c:c621:151::1, len 192\n"
+ "output: in:(unknown 0) out:Interco, connection-state:established proto ICMP (type 128, code 0), 2a0c:b641:111::1->2a0c:b641:111::2, len 16\n"
+ "in:freebox out:Interco, connection-state:new,dnat src-mac 20:66:cf:18:cf:15, proto TCP (SYN), 18.130.12.138:51566->10.2.70.1:443, NAT 18.130.12.138:51566->(82.66.103.223:443->10.2.70.1:443), len 60\n"
+ "in:Wireguard-R0 out:(unknown 0), connection-state:established proto TCP (ACK,PSH), 10.255.1.1:179->10.255.1.2:34601, len 196\n"
+ "in:Wireguard-R0 out:(unknown 0), connection-state:established proto TCP (ACK), 10.255.1.1:179->10.255.1.2:34601, len 52\n"
+ "in:Wireguard-R0 out:(unknown 0), connection-state:established proto TCP (ACK,PSH), 10.255.1.1:179->10.255.1.2:34601, len 205\n"
+ "in:freebox out:Interco, connection-state:new,dnat src-mac 20:66:cf:18:cf:15, proto TCP (SYN), 18.130.12.138:39888->10.2.70.1:443, NAT 18.130.12.138:39888->(82.66.103.223:443->10.2.70.1:443), len 60\n"
+ "in:WAN out:Interco, connection-state:established,snat src-mac 80:2d:bf:8e:31:f7, proto UDP, [2620:2d:4000:1::41]:123->[2a0c:b641:112:20:250:56ff:fea9:578d]:41270, len 56\n"
+ "in:WAN out:Interco, connection-state:established,snat src-mac 80:2d:bf:39:f5:47, proto TCP (SYN,ACK), [2606:4700:4700::1111]:53->[2a0c:b641:112:40:20c:29ff:fe69:e5e7]:45257, len 40\n"
+ "srcnat: in:Interco out:WAN, connection-state:new src-mac 00:0c:29:16:06:aa, proto TCP (SYN), 10.1.40.1:34543->8.8.8.8:53, len 60\n";
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