Java正則表達式提取兩個單詞之間的字符串

Question

我有一個看起來像這樣的字符串

<br/><description>Using a combination of remote probes, (TCP/IP, SMB, HTTP, NTP, SNMP, etc...) it is possible to guess the name of the remote operating system in use, and sometimes its version.</description><br/><fname>os_fingerprint.nasl</fname><br/><plugin_modification_date>2012/12/01</plugin_modification_date><br/><plugin_name>OS Identification</plugin_name><br/><plugin_publication_date>2003/12/09</plugin_publication_date><br/><plugin_type>combined</plugin_type><br/><risk_factor>None</risk_factor><br/><solution>n/a</solution><br/><synopsis>It is possible to guess the remote operating system.</synopsis><br/><plugin_output><br/>Remote operating system : Microsoft Windows Server 2008 R2 Enterprise Service Pack 1<br/>Confidence Level : 99<br/>Method : MSRPC<br/><br/> <br/>The remote host is running Microsoft Windows Server 2008 R2 Enterprise Service Pack 1</plugin_output><br/>

我想提取“遠程操作系統：”並獲取“Microsoft Windows Server 2008 R2 Enterprise Service Pack 1”。

Remote operating system : Microsoft Windows Server 2008 R2 Enterprise Service Pack 1<br/>

所以我使用了正則表達式

Pattern pattern = Pattern.compile("(?<=\\bRemote operating system :\\b).*?(?=\\b<br/>\\b)");

但我的正則表達似乎沒有奏效。 任何想法？ 這也是提取這個操作系統字符串的好方法，或者我應該采取另一種方式嗎？ 謝謝！

Answer 1

試試這種模式： ".*Remote operating system : (.*?)<br/>"

public static void main(String[] args) throws Exception {
    String s = "<br/><description>Using a combination of remote probes, (TCP/IP, SMB, HTTP, NTP, SNMP, etc...) it is possible to guess the name of the remote operating system in use, and sometimes its version.</description><br/><fname>os_fingerprint.nasl</fname><br/><plugin_modification_date>2012/12/01</plugin_modification_date><br/><plugin_name>OS Identification</plugin_name><br/><plugin_publication_date>2003/12/09</plugin_publication_date><br/><plugin_type>combined</plugin_type><br/><risk_factor>None</risk_factor><br/><solution>n/a</solution><br/><synopsis>It is possible to guess the remote operating system.</synopsis><br/><plugin_output><br/>Remote operating system : Microsoft Windows Server 2008 R2 Enterprise Service Pack 1<br/>Confidence Level : 99<br/>Method : MSRPC<br/><br/> <br/>The remote host is running Microsoft Windows Server 2008 R2 Enterprise Service Pack 1</plugin_output><br/>";

    Pattern pattern = Pattern.compile(".*Remote operating system : (.*?)<br/>");
    Matcher m = pattern.matcher(s);
    if (m.find()) {
      System.out.println(m.group(1));
    }
    else System.out.println("Not found");
}

Answer 2

有后面沒有空格:和之前\\\\b在您的正則表達式。

試試這種方式：

Pattern.compile("(?<=\\bRemote operating system : \\b).*?(?=\\b<br/>\\b)");
//                                               ^additional space

沒有那個空格\\\\b將不匹配新單詞的開頭（微軟）（它也永遠不會匹配單詞的結尾，因為:不能正確的單詞結束）。

Answer 3

String test = 
        "<br/><description>Using a combination of remote probes, " +
        "(TCP/IP, SMB, HTTP, NTP, SNMP, etc...) it is possible to guess " +
        "the name of the remote operating system in use, and sometimes " +
        "its version.</description><br/><fname>os_fingerprint.nasl</fname>" +
        "<br/><plugin_modification_date>2012/12/01</plugin_modification_date>" +
        "<br/><plugin_name>OS Identification</plugin_name><br/>" +
        "<plugin_publication_date>2003/12/09</plugin_publication_date><br/>" +
        "<plugin_type>combined</plugin_type><br/><risk_factor>None</risk_factor>" +
        "<br/><solution>n/a</solution><br/><synopsis>It is possible to guess the " +
        "remote operating system.</synopsis><br/><plugin_output><br/>Remote operating " +
        "system : Microsoft Windows Server 2008 R2 Enterprise Service Pack 1<br/>" +
        "Confidence Level : 99<br/>Method : MSRPC<br/><br/> <br/>The remote host is " +
        "running Microsoft Windows Server 2008 R2 Enterprise Service Pack 1" +
        "</plugin_output><br/>";
        Pattern pattern = Pattern.compile("Remote\\soperating\\ssystem\\s:\\s(.+?)\\<br/>");
        Matcher matcher = pattern.matcher(test);
        if (matcher.find()) {
            System.out.println(matcher.group(1));
        }

輸出：

Microsoft Windows Server 2008 R2 Enterprise Service Pack 1

請注意，通常不建議使用正則表達式來對抗標記語言。 但是在這里你使用正則表達式來對付特定的文本字符串，這恰好只是在標記內部，所以我猜它沒關系。

Answer 4

嘗試下一個：

if (str.matches("^.*Remote operating system : ([^<]*).*$")) {
    System.out.println(
        str.replaceAll("^.*Remote operating system : ([^<]*).*$", "$1")
    );
}