Additional code to FlimFlan.ReadableRex

using System;
using System.Text;

namespace FlimFlan.ReadableRex
{
    public class Alternation
    {
        // ...code...
        public Pattern Either(params Pattern[] options)
        {
            if (options == null) throw new ArgumentNullException("options");
            var length = options.Length;
            var lengthMinus1 = length - 1;
            if ((length == 0) || (length == 1))
                throw new InvalidOperationException("options.Length must be greater than 1");
            StringBuilder sb = new StringBuilder("(");
            for (int i = 0; i < length; i++)
            {
                sb.Append(options[i]);
                if (i != lengthMinus1)
                    sb.Append("|");
            }
            sb.Append(")");
            var s = sb.ToString();
            return _precedingPattern.RegEx(s);
        }
    }
}