RegEx Faces

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;

namespace _07_happinessIndex
{
    class happinessIndex
    {
        static void Main(string[] args)
        {
            string input = Console.ReadLine();
            Regex happyPattern = new Regex(@"(:\)|:D|;\)|:\*|:]|;]|:}|;}|\(:|\*:|c:|\[:|\[;)");
            Regex sadPattern = new Regex(@"(:\(|D:|;\(|:\[|;\[|:\{|;\{|\):|:c|\]:|\];)");

            string[] happy = happyPattern.Matches(input)
                .Cast<Match>()
                .Select(h => h.Value)
                .ToArray();

            string[] sad = sadPattern.Matches(input)
                .Cast<Match>()
                .Select(s => s.Value)
                .ToArray();

            double happyCount = happy.Count();
            double sadCount = sad.Count();

            double happyIndex = happyCount / sadCount;

            if (happyIndex >= 2.00)
            {
                Console.WriteLine($"Happiness index: {happyIndex:F2} :D");
                Console.WriteLine($"[Happy count: {happyCount}, Sad count: {sadCount}]");
            }
            else if(happyIndex > 1.00)
            {
                Console.WriteLine($"Happiness index: {happyIndex:F2} :)");
                Console.WriteLine($"[Happy count: {happyCount}, Sad count: {sadCount}]");
            }
            else if(happyIndex == 1.00)
            {
                Console.WriteLine($"Happiness index: {happyIndex:F2} :|");
                Console.WriteLine($"[Happy count: {happyCount}, Sad count: {sadCount}]");
            }
            else
            {
                Console.WriteLine($"Happiness index: {happyIndex:F2} :(");
                Console.WriteLine($"[Happy count: {happyCount}, Sad count: {sadCount}]");
            }
        }
    }
}