using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"(?:(da|en-gb|en|\*))(?!.*\1(?!-))(?:;q=(?:1|0(\.\d+)?))?(?:,(da|en-gb|en|\*)(?!.*\3(?!-))(?:;q=(?:1|0(?:\.\d+)?))?)*";
string input = @"enenen-gben
enenenen-gb
Accept-Language: da, en-gb;q=0.8, en;q=0.7
en;q=0,da;q=0.4,*;q=0.4,da;q=0.4";
foreach (Match m in Regex.Matches(input, pattern))
{
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