jellyfin-jellyfin-1/src/Jellyfin.Extensions/StringExtensions.cs

using System;

namespace Jellyfin.Extensions
{
    /// <summary>
    /// Provides extensions methods for <see cref="string" />.
    /// </summary>
    public static class StringExtensions
    {
        /// <summary>
        /// Counts the number of occurrences of [needle] in the string.
        /// </summary>
        /// <param name="value">The haystack to search in.</param>
        /// <param name="needle">The character to search for.</param>
        /// <returns>The number of occurrences of the [needle] character.</returns>
        public static int Count(this ReadOnlySpan<char> value, char needle)
        {
            var count = 0;
            var length = value.Length;
            for (var i = 0; i < length; i++)
            {
                if (value[i] == needle)
                {
                    count++;
                }
            }

            return count;
        }
    }
}