Regex Match Date Time

// (19|20|21)\d\d[-](0[1-9]|1[012])[-](0[1-9]|[12][0-9]|3[01])\s([0-1][0-9]|2[0-3])[:]([0-5][0-9])[:]([0-5][0-9])
//  using System.Text.RegularExpressions;
/// <summary>
///  Regular expression built for C# on: Wed, Oct 7, 2015, 04:51:18 PM
///  Using Expresso Version: 3.0.4750, http://www.ultrapico.com
///
///  A description of the regular expression:
///
///  [1]: A numbered capture group. [19|20|21]
///      Select from 3 alternatives
///          19
///              19
///          20
///              20
///          21
///              21
///  \d\d
///      Any digit
///      Any digit
///  Any character in this class: [-]
///  [2]: A numbered capture group. [0[1-9]|1[012]]
///      Select from 2 alternatives
///          0[1-9]
///              0
///              Any character in this class: [1-9]
///          1[012]
///              1
///              Any character in this class: [012]
///  Any character in this class: [-]
///  [3]: A numbered capture group. [0[1-9]|[12][0-9]|3[01]]
///      Select from 3 alternatives
///          0[1-9]
///              0
///              Any character in this class: [1-9]
///          [12][0-9]
///              Any character in this class: [12]
///              Any character in this class: [0-9]
///          3[01]
///              3
///              Any character in this class: [01]
///  Whitespace
///  [4]: A numbered capture group. [[0-1][0-9]|2[0-3]]
///      Select from 2 alternatives
///          [0-1][0-9]
///              Any character in this class: [0-1]
///              Any character in this class: [0-9]
///          2[0-3]
///              2
///              Any character in this class: [0-3]
///  Any character in this class: [:]
///  [5]: A numbered capture group. [[0-5][0-9]]
///      [0-5][0-9]
///          Any character in this class: [0-5]
///          Any character in this class: [0-9]
///  Any character in this class: [:]
///  [6]: A numbered capture group. [[0-5][0-9]]
///      [0-5][0-9]
///          Any character in this class: [0-5]
///          Any character in this class: [0-9]
///
///
/// </summary>
public static Regex regex = new Regex(
      "(19|20|21)\\d\\d[-](0[1-9]|1[012])[-](0[1-9]|[12][0-9]|3[01]"+
      ")\\s([0-1][0-9]|2[0-3])[:]([0-5][0-9])[:]([0-5][0-9])",
    RegexOptions.Multiline
    | RegexOptions.Compiled
    );


// This is the replacement string
public static string regexReplace =
      "NewItem.$1 = this.$1;";


//// Replace the matched text in the InputText using the replacement pattern
// string result = regex.Replace(InputText,regexReplace);

//// Split the InputText wherever the regex matches
// string[] results = regex.Split(InputText);

//// Capture the first Match, if any, in the InputText
// Match m = regex.Match(InputText);

//// Capture all Matches in the InputText
// MatchCollection ms = regex.Matches(InputText);

//// Test to see if there is a match in the InputText
// bool IsMatch = regex.IsMatch(InputText);

//// Get the names of all the named and numbered capture groups
// string[] GroupNames = regex.GetGroupNames();

//// Get the numbers of all the named and numbered capture groups
// int[] GroupNumbers = regex.GetGroupNumbers();