Question

我试图使用正则表达式从我的tnsnames文件中提取一些信息。我从以下模式开始：

MYSCHEMA *? = *?[\W\w\S\s]*\(HOST *?= *?(?<host>\w+\s?)\)\s?\(PORT *?= *?(?<port>\d+)\s?\)[\W\w\S\s]*\(SERVICE_NAME *?= *?(?<servicename>\w+)\s?\)

当MYSCHEMA是文件中唯一的模式时工作正常，但是当MYSCHEMA之后列出的其他模式一直匹配到最后一个模式时。

我已经创建了一个新模式：

MYSCHEMA *=\s*\(DESCRIPTION =\s*\(ADDRESS *= *\(PROTOCOL *= *TCP\)\(HOST *= *(?<host>\w+)\)\(PORT *= *(?<port>\d+)\)\)\s*\(CONNECT_DATA *=\s*(?<serverdedicated>\(SERVER *= *DEDICATED\))\s*\(SERVICE_NAME *= *(?<servicename>[\w\.]+) *\)\s*\)\s*\)

此模式仅与MYSCHEMA匹配，但我必须添加MYSCHEMA条目中出现的每个元素，如果它不包含所有相同元素，则不匹配MYOTHERSCHEMA。

理想情况下，我想要一个仅匹配MYSCHEMA条目的模式，并捕获HOST，PORT和SERVICE NAME，并可选地（SERVER = DEDICATED）（我在第一个模式中没有）到命名组。 / p>

以下是我用于测试的示例tnsnames：

SOMESCHEMA =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = REMOTEHOST)(PORT = 1234))
    )
    (CONNECT_DATA = (SERVICE_NAME = REMOTE)
    )
  )

MYSCHEMA =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = MYHOST)(PORT = 1234))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = MYSERVICE.LOCAL )
    )
  )

MYOTHERSCHEMA =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = MYHOST)(PORT = 1234))
    )
    (CONNECT_DATA = 
      (SERVICE_NAME = MYSERVICE.REMOTE)
    )

  )

SOMEOTHERSCHEMA = 
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = LOCALHOST)(PORT = 1234))
    )
    (CONNECT_DATA =
      (SERVICE_NAME = LOCAL)
    )
  )

Answer 1

这应该使用平衡组来完成。并根据您的需要修改开关/外壳。

class TnsRegex
{
    public void Test()
    {
        Regex reTns = new Regex(_pattern, RegexOptions.Singleline | RegexOptions.IgnorePatternWhitespace);
        MatchCollection matchCollection = reTns.Matches(_text);

        foreach (Match match in matchCollection)
        {
            foreach (Capture capture in match.Groups["Settings"].Captures)
            {
                string[] setting = capture.Value.Split(new[] { '=' }, StringSplitOptions.RemoveEmptyEntries);
                string key = setting[0].Trim();
                string val = setting[1].Trim();
                if (val.Contains("(")) continue;
                switch (key)
                {
                    case "HOST":
                        break;
                    case "PORT":
                        break;
                    case "SERVICE_NAME":
                        break;
                    case "SERVER":
                        break;
                }
                Console.WriteLine(key + ":" + val);
            }
        }
    }
    string _pattern = @"
        MYSCHEMA\s+=\s+\(
        [^\(\)]*
        (
                    (
                                (?<Open>\()
                                [^\(\)]*
                    )+
                    (
                                (?<Settings-Open>\))
                                [^\(\)]*
                    )+
        )*
        (?(Open)(?!))
    \)";

    string _text = @"
    MYSCHEMA =
      (DESCRIPTION =
        (ADDRESS = (PROTOCOL = TCP)(HOST = MYHOST)(PORT = 1234))
        (CONNECT_DATA =
          (SERVER = DEDICATED)
          (SERVICE_NAME = MYSERVICE.LOCAL )
        )
      )

    SOMESCHEMA =
      (DESCRIPTION =
        (ADDRESS_LIST =
          (ADDRESS = (PROTOCOL = TCP)(HOST = REMOTEHOST)(PORT = 1234))
        )
        (CONNECT_DATA = (SERVICE_NAME = REMOTE)
        )
      )
    ";
}

Answer 2

好吧，既然我没有找到这个问题的令人信服的答案（没有进攻@Mikael Svenson），我只是坚持我的问题中列出的第二种模式。暂时就足够了，因为tnsnames.ora文件始终遵循组织内的确切模式。如果tnsnames.ora文件格式发生变化，我很可能会采用解析器。

Answer 3

此表达式使用address_list等上的一个地址解析模式。希望这会有所帮助。

- 开始？（大于（（[\ n]的[\ s]的 [^（] [\ W _] +）[\ s]的 = [\ s]的））（？＆GT;（[\ n \ S（说明\ S = \ S] （大于？？？？（[\ n \ S（] * ADDRESS_LIST [\ S = \ S] * [ \ n \ S（ ADDRESS [\ S = \ S] （？（[\ n \ S（]社群）（[\ n \ S（]社群[\ S = \ S] < EM>（[\瓦特？）] +））|？（））[\ S \ n]的（（\ n \ S（] PROTOCOL）（[\ n \ S（] PROTOCOL [\ S = \ S] （[\ W？）。] +））|？（））[\ S \ n]的（（\ n \ S（] HOST）（[\ n \ S（] HOST [\ S = \ S] （[\ W）] +？））|？（））[\ S \ n]的（（\ n \ S（] PORT ）（[\ n \ S（] PORT [\ S = \ S] （[\ w）的。] +？））|？（））[\ S \ n]的（（））（））|（））））[\ S \ n]的（＆gt;有（[\ n]的[\ s]的 [（] CONNECT_DATA \ S * [=] \ S * [ \ n]的（？（[（] SID \ S [=] \ S *） - （（[（] SID \ S * [=] \ S *（？[\瓦特] +） \ S * [）]））|？（））[\ S \ n]的（（[（] SERVER \ S [=] \ S *） - （（[（] SERVER \ S * [=] \ S * \ S * [）]））（[\瓦特] +？）|？（））[\ S \ n]的*（（[（] SERVICE_NAME \ S * [=] \ S * ）（（[（] SERVICE_NAME \ S * [=] \ S *（[\瓦特] +）\ S * [）]））|？（））[\ S \ n]的（（））（））|（））））[\ S \ n]的（（））（））|？（）））） * - 端

毫无疑问，问题在于写文件的形式是多重的。正如您所说，文件必须是唯一的，这可以通过使用TNS_ADMIN变量来解决。

Answer 4

以下正则表达式将解析单个TNS条目，您所要做的就是解析每个结果，看你认为哪些名称/值

([\w-]+)\s*=(?:\s|.)+?\)\s*\)\s*\)\s*(?=[\w\-])

示例：https://regexr.com/3r2vn

Answer 5

我尝试了以上答案，但没有一个对我有用...

    [DebuggerDisplay("Name {Name} Host:{Host} ServiceName:{ServiceName} Port:{Port}")]
    public class TnsEntry
    {
        public string Name { get; set; }
        public string Host { get; set; }
        public string Port { get; set; }
        public string ServiceName { get; set; }
    }


   public class TnsNamesFileParser
   {
    public string TNSNamesContents { get; set; }

    public TnsNamesFileParser()
    {
    }

    public TnsNamesFileParser(string locationAndNameOfTnsNamesFile)
    {
        TNSNamesContents = System.IO.File.ReadAllText(locationAndNameOfTnsNamesFile);
    }

    public List<TnsEntry> Parse()
    {
        return Parse(TNSNamesContents);
    }

    public List<TnsEntry> Parse(string TNSNamesContents)
    {
        string TNSPattern = @"([\w -] +)\s *= (?:\s |.) +?\)\s *\)\s *\)\s * ((?=[\w\-])|(?=$))";

        Regex reTns = new Regex(TNSPattern, RegexOptions.Singleline | RegexOptions.IgnorePatternWhitespace);
        MatchCollection matchCollection = reTns.Matches(TNSNamesContents);

        var TnsEntries = new List<TnsEntry>();

        foreach (Match match in matchCollection)
        {
            var tnsEntry = new TnsEntry();
            string matchedValue = match.Value.Trim();

            tnsEntry.Name = Regex.Match(matchedValue, @"^([^\s]+)", RegexOptions.IgnoreCase)?.Value.Trim();
            tnsEntry.Host = Regex.Match(matchedValue, "(?<=HOST.+=) ([^)]*)", RegexOptions.IgnoreCase)?.Value.Trim();
            tnsEntry.Port = Regex.Match(matchedValue, "(?<=PORT.+=) ([^)]*)", RegexOptions.IgnoreCase)?.Value.Trim();
            tnsEntry.ServiceName = Regex.Match(matchedValue, "(?<=SERVICE_NAME.+=) ([^)]*)", RegexOptions.IgnoreCase)?.Value;

            TnsEntries.Add(tnsEntry);

        }

        return TnsEntries;
    }
  }

//Test Code: 

string testdata =@"
        SOMESCHEMA =
        (DESCRIPTION =
        (ADDRESS_LIST =
        (ADDRESS = (PROTOCOL = TCP)(HOST = REMOTEHOST)(PORT = 1234))
        )
        (CONNECT_DATA = (SERVICE_NAME = REMOTE)
        )
        )

        MYSCHEMA =
        (DESCRIPTION =
        (ADDRESS = (PROTOCOL = TCP)(HOST = MYHOST)(PORT = 1234))
        (CONNECT_DATA =
        (SERVER = DEDICATED)
        (SERVICE_NAME = MYSERVICE.LOCAL )
        )
        )

        MYOTHERSCHEMA =
        (DESCRIPTION =
        (ADDRESS_LIST =
        (ADDRESS = (PROTOCOL = TCP)(HOST = MYHOST)(PORT = 1234))
        )
        (CONNECT_DATA = 
        (SERVICE_NAME = MYSERVICE.REMOTE)
        )
        )

        SOMEOTHERSCHEMA = 
        (DESCRIPTION =
        (ADDRESS_LIST =
        (ADDRESS = (PROTOCOL = TCP)(HOST = LOCALHOST)(PORT = 1234))
        )
        (CONNECT_DATA =
        (SERVICE_NAME = LOCAL)
        )
        )";
 [Test]
 public void ParseTNSFileEntries()
 {

  var tnsNamesFileParser = new TnsNamesFileParser();
  var entries =  tnsNamesFileParser.Parse(testdata);


 }

使用正则表达式解析tnsnames.ora

5 个答案: