Регулярное выражение для строки подключения

            Regex _dataSource = new Regex(@"Data Source.*?;");
            Match match = _dataSource.Match(connect);

string connectionString = "Data Source=xx1;Initial Catalog=XXX2.mdf;User ID=xxx;Password=xxy";
foreach (Match m in Regex.Matches(connectionString, @"([\w ]+)=([^;]+);?"))
{
    Console.WriteLine(m.Groups[2].Value);
}

using System.Data.Common;
...
var csb = new DbConnectionStringBuilder();
csb.ConnectionString = "Data Source=xx1;Initial Catalog=XXX2.mdf;User ID=xxx;Password=xxy";
foreach (KeyValuePair<string, object> kvp in csb)
{
    string value = kvp.Value.ToString();
    Console.WriteLine(value);
}

var csb = new DbConnectionStringBuilder();
csb.ConnectionString = "abc=123; xyz=\"1;2\"";
foreach (KeyValuePair<string, object> kvp in csb)
{
    Console.WriteLine("{0}={1}", kvp.Key, kvp.Value);
}

csb.ConnectionString = "password=\"123;abc=123\"";

csb.ConnectionString = "password='\"123;abc=123\"'";

            Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
            var connect = config.ConnectionStrings.ConnectionStrings["DBConnection"].ConnectionString;

            SqlConnectionStringBuilder builder = new SqlConnectionStringBuilder(connect);
            textbox1=builder.DataSource;