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

namespace Szmedi.RevitToolkit.Approval.Extensions
{
    internal static class Extension
    {
        /// <summary>
        /// 提取字符串中所有中文字符
        /// </summary>
        public static string ExtractChinese(this string text)
        {
            if (string.IsNullOrEmpty(text)) return string.Empty;

            // 先将非中文替换为空格，再将连续空格替换为单个空格，最后去除首尾空格
            var result = Regex.Replace(text, @"[^\u4e00-\u9fa5]", " ");
            result = Regex.Replace(result, @"\s+", " ").Trim();
            return result;
        }
    }
}