How to find whether a string contains any of the special characters?

Question

I want to find whether a string contains any of the special characters like !,@,#,$,%,^,&,*,(,)....etc.

How can I do that without looping thorugh all the charact

Answer 1

Using PHP, you can try:

if (preg_match("[^A-Za-z0-9]", $yourString) {
  //DO WHATEVER
}

This will return TRUE if the string contains anything other than a letter or number.

Hope this helps.

Answer 2

  Regex RgxUrl = new Regex("[^a-z0-9]");
                    blnContainsSpecialCharacters = RgxUrl.IsMatch(stringToCheck);

Answer 3

//apart from regex we can also use this
string input = Console.ReadLine();
            char[] a = input.ToCharArray();
            char[] b = new char[a.Length];
            int count = 0;
            for (int i = 0; i < a.Length; i++)
            {
                if (!Char.IsLetterOrDigit(a[i]))
                {
                    b[count] = a[i];
                    count++;
                }
            }
            Array.Resize(ref b, count);
            foreach(var items in b)
            {
                Console.WriteLine(items);
            }
            Console.ReadLine();
//it will display the special characters in the string input

Answer 4

public static bool HasSpecialCharacters(string str)
{
  string specialCharacters = @"%!@#$%^&*()?/>.<,:;'\|}]{[_~`+=-" +"\"";
  char[] specialCharactersArray = specialCharacters.ToCharArray();

  int index = str.IndexOfAny(specialCharactersArray);
  //index == -1 no special characters
  if (index == -1)
    return false;
  else
    return true;
}