using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"^(000[1-9]|00[1-9]\d|0[1-9]\d\d|100\d|10[1-9]\d|1[1-9]\d{2}|[2-9]\d{3}|[1-9]\d{4}|1\d{5}|2[0-6]\d{4}|27[0-4]\d{3}|275[0-6]\d{2}|2757[0-5]\d|275760)-(0[1-9]|1[012])-(0[1-9]|[12]\d|3[01])T(0\d|1\d|2[0-4]):(0\d|[1-5]\d)(?::(0\d|[1-5]\d))?(?:.(00\d|0[1-9]\d|[1-9]\d{2}))?$";
string input = @"2018-06-14T00:00
2018-06-14T00:00:12
2018-06-14T00:00:12.551
Minimum to provide to be valid :
yyyy-MM-ddThh:mm
";
RegexOptions options = RegexOptions.Multiline;
foreach (Match m in Regex.Matches(input, pattern, options))
{
Console.WriteLine("'{0}' found at index {1}.", m.Value, m.Index);
}
}
}
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for C#, please visit: https://msdn.microsoft.com/en-us/library/system.text.regularexpressions.regex(v=vs.110).aspx