used to remove characters not allowed in product names

NotAllowedCharacters.cs

using System.Text.RegularExpressions;

namespace Utils.Text
{
	public static class NotAllowedCharacters
	{
		private const string AccentsCharactersAllowed = "áéíóúâêîôûãõàèìòùäëïöüçñÁÉÍÓÚÂÊÎÔÛÃÕÀÈÌÒÙÄËÏÖÜÇÑ`´";
		private const string SpecialCharactersAllowed = "-+÷\\/><=≠.,:;\'\"!¡?¿{}[]()@#*&€$%*°ºª²³⅓⅔⅛⅜⅝⅞_";

		public static bool Contains(string text)
		{
			return !string.IsNullOrWhiteSpace(text) && (!Regex.IsMatch(text, PatternAllowedCharacters) || Regex.IsMatch(text, PatternDoubleSpaces));
		}

		public static string Replace(string text, char? replacement = null)
		{
			return string.IsNullOrWhiteSpace(text) ? text : Regex.Replace(Regex.Replace(text, PatternNotAllowedCharacters, ""), PatternDoubleSpaces, " ");
		}

		private static string PatternAllowedCharacters => $"^[{ToRegexString(SpecialCharactersAllowed)}{ToRegexString(AccentsCharactersAllowed)} a-zA-Z0-9]+$";

		private static string PatternNotAllowedCharacters => $"[^{ToRegexString(SpecialCharactersAllowed)}{ToRegexString(AccentsCharactersAllowed)} a-zA-Z0-9]";

		private static string PatternDoubleSpaces => $"\\s\\s+";

		private static string ToRegexString(string text)
		{
			return text
				.Replace("(", "\\(")
				.Replace(")", "\\)")
				.Replace("[", "\\[")
				.Replace("]", "\\]");
		}
	}
}