Parsing tnsnames.ora using regex

Question

I am attempting to pull some information from my tnsnames file using regex. I started with the following pattern:

MYSCHEMA *? = *?[\\W\\w\\S\\s]*\\(HOST *?= *

Answer 1

This should do it, using balanced groups. And modify the switch/case for your needs.

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)(?!))
    \)";

    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)
        )
      )
    ";
}