// Copyright (c) 2020 Tudor Stanciu using System.Text.RegularExpressions; namespace Tuitio.Domain.Helpers { internal static class DataValidationHelper { public static bool StringIsBase64(string str) { str = str.Trim(); return (str.Length % 4 == 0) && Regex.IsMatch(str, @"^[a-zA-Z0-9+/]*={0,3}$", RegexOptions.None); } } }