using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"(?:^(?!.*([._-])[._-]{1,})[A-Za-z0-9][A-Za-z0-9._-]{0,33}[A-Za-z0-9]$)|(?:^[A-Za-z0-9]{1,2}$)";
string input = @"OKs
A
AB
1
2022
ABC123
ABC-123
ABC-DE-123
ABC-DE.123
NOT_OK!
-
A-
-A
ABC--123
ABC.-123
";
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