java - 如何用正则表达式有效过滤掉一些子字符串？

Question

我想从输入字符串中过滤掉 srcport 和 dstport。这是我尝试过的代码:

String input = "2014<>10.100.2.3<><189>date=2014-01-16,time=11:26:14,devname=B3909601569,devid=B3909601569,logid=000013,type=traffic,srcip=192.168.192.123,srcport=2072,srcintf=port2,dstip=10.180.1.105,dstport=3206,dstintf=port1,sessionid=121543,status=close,policyid=196,service=MYSQL,proto=6,duration=10,sentbyte=3910,rcvdbyte=175085,sentpkt=74,rcvdpkt=132";

Pattern p = Pattern.compile("(srcport=)(\\d+).[\\s]?(dstport=)(\\d+)");
Matcher m = p.matcher(input);

StringBuffer result=new StringBuffer();

while (m.find()) {

System.out.println("Srcport: " + m.group(2) + " & ");
System.out.println("Dstport: " + m.group(4));

}

System.out.println(result);

但它没有显示任何输出。正则表达式是否有错误

Pattern p = Pattern.compile("(srcport=)(\\d+).[\\s]?(dstport=)(\\d+)");

或 println 行

System.out.println("Srcport: " + m.group(2) + " & ");
System.out.println("Dstport: " + m.group(4));"

任何建议都将受到高度赞赏。

Answer 1

查看对正则表达式和捕获组的以下更改:

    String input = "2014<>10.100.2.3<><189>date=2014-01-16,time=11:26:14,devname=B3909601569,devid=B3909601569,logid=000013,type=traffic,srcip=192.168.192.123,srcport=2072,srcintf=port2,dstip=10.180.1.105,dstport=3206,dstintf=port1,sessionid=121543,status=close,policyid=196,service=MYSQL,proto=6,duration=10,sentbyte=3910,rcvdbyte=175085,sentpkt=74,rcvdpkt=132";
    Pattern p = Pattern.compile("srcport=(\\d+).*?dstport=(\\d+)"); // update regex
    Matcher m = p.matcher(input);

    StringBuffer result=new StringBuffer();

    while (m.find()) {

        System.out.println("Srcport: " + m.group(1)); //print groups 1 + 2
        System.out.println("Dstport: " + m.group(2));

    }

    System.out.println(result);