using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"\|\K(?=.{1,253}\|)(?!.*--.*)(?P<fqdn>(?:(?!-)(?![0-9])[a-zA-Z0-9-]{1,63}(?<!-)\.){1,}(?:(?!-)[a-zA-Z0-9-]{1,63}(?<!-)))\|";
string input = @"|abc123-bar-qwerty.foo.com|
|foo.bar|
|foo.bar.com|
|foo--bar.com|
|aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa.63|
|aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa.64|
|aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa.aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa.aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa.aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa.a.253|
|aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa.aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa.aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa.aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa.aa.254|
|1.2.3.4.5.6.7.8.9.10.11.12.13|
|1.2.3.4.5.6.7.8.9.10.11.12.13.14|
|133tfoo.bar.com|
|foo|
|foo.|
|foo.bar.|
|foo-|
|foo-.|
|foo-.bar|
|foo-.bar.|
|foo-.bar-.com|
|.foo-bar|
|foo-bar|
|foo-.bar|
|-foo-bar|
|--foo-bar|
|foo--bar|
|foo-bar.|";
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