Question

Previously on How to check if a String contains any letter from a to z? I have learnt how to use Regex to detect letters from a to z.

Can we make Regex to detect any symbols too? Like . , ! ? @ # $ % ^ & * ( ) or any other else.

More specifically, I want to accept only digits in my string.

Answer 1

To match string containing only digits or empty string use regex pattern ^\d*$

To match string containing only digits, not allowing an empty string use regex pattern ^\d+$

Console.WriteLine((new Regex(@"^\d+$")).IsMatch(string) ? "Yes" : "No");

Test this code here.

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