BirdsiteLIVE/src/BirdsiteLive.Domain/Tools/PatternsParser.cs

using System;
using System.Linq;

namespace BirdsiteLive.Domain.Tools
{
    public class PatternsParser
    {
        public static string[] Parse(string entry)
        {
            if (string.IsNullOrWhiteSpace(entry))
                return new string[0];

            var separationChar = '|';
            if (entry.Contains(";"))
                separationChar = ';';
            else if (entry.Contains(","))
                separationChar = ',';

            var splitEntries = entry
                .Split(new[] { separationChar }, StringSplitOptions.RemoveEmptyEntries)
                .Where(x => !string.IsNullOrWhiteSpace(x))
                .Select(x => x.ToLowerInvariant().Trim());
            return splitEntries.ToArray();
        }
    }
}