DiscordChatExporter/DiscordChatExporter.Core/Exporting/Filtering/MentionsMessageFilter.cs

using DiscordChatExporter.Core.Discord.Data;
using System;
using System.Linq;

namespace DiscordChatExporter.Core.Exporting.Filtering
{
    public class MentionsMessageFilter : MessageFilter
    {
        private readonly string _value;

        public MentionsMessageFilter(string value) => _value = value;

        public override bool Filter(Message message) =>
            message.MentionedUsers.Any(user =>
                string.Equals(_value, user.Name, StringComparison.OrdinalIgnoreCase) ||
                string.Equals(_value, user.FullName, StringComparison.OrdinalIgnoreCase) ||
                string.Equals(_value, user.Id.ToString(), StringComparison.OrdinalIgnoreCase));
    }
}