Test_Kvalif/WpfApp1/Methods/WordOnlyMeth.cs

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

namespace WpfApp1.Methods
{
    public class WordOnlyMeth
    {
        public bool WordOnly(string text)
        {
            Regex regex = new Regex("[^А-Яа-яЁё]+");
            bool check = regex.IsMatch(text);
            if (check == true)
            {
                return false;
            }
            return true;
        }
    }
}