Detecting whitespace in textbox

Question

In a WinForms textbox with multiple whitespaces (e.g. 1 1 A), where, between the 1s, there is whitespace, how could I detect this via the string methods or regex?

Answer 1

Not pretty clear what the problem is, but in case you just want a way to tell if there is a white space anywhere in a given string, a different solution to the ones proposed by the other stack users (which also work) is:

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

namespace Testing
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine(PatternFound("1 1 a"));
            Console.WriteLine(PatternFound("1     1    a"));
            Console.WriteLine(PatternFound("            1     1   a"));

        }

        static bool PatternFound(string str)
        {
            Regex regEx = new Regex("\\s");
            Match match = regEx.Match(str);
            return match.Success;
        }
    }
}

in case what you want is determining whether a given succession of consecutive white spaces appear, then you will need to add more to the regex pattern string. Refer to http://msdn.microsoft.com/en-us/library/az24scfc(v=vs.110).aspx for the options.