Check for special characters (/*-+_@&$#%) in a string?

Question

How do I check a string to make sure it contains numbers, letters, or space only?

Answer 1

如何检查字符串以确保它仅包含数字，字母或空格？

Answer 2

如何检查字符串以确保它仅包含数字，字母或空格？

Answer 3

如何检查字符串以确保它仅包含数字，字母或空格？

Answer 4

如何检查字符串以确保它仅包含数字，字母或空格？

Answer 5

如何检查字符串以确保它仅包含数字，字母或空格？

Answer 6

如何检查字符串以确保它仅包含数字，字母或空格？

Answer 7

如何检查字符串以确保它仅包含数字，字母或空格？

Answer 8

如何检查字符串以确保它仅包含数字，字母或空格？

Answer 9

如何检查字符串以确保它仅包含数字，字母或空格？

Answer 10

Create a method and call it hasSpecialChar with one parameter and use foreach to check every single character in the textbox, add as many characters as you want in the array, in my case i just used ) and ( to prevent sql injection.

public void hasSpecialChar(string input)
    {
        char[] specialChar = {'(',')'};
        foreach (char item in specialChar)
        {
            if (input.Contains(item)) MessageBox.Show("it contains");
        }
    }

in your button click evenement or you click btn double time like that:

private void button1_Click(object sender, EventArgs e)
    {
       hasSpecialChar(textbox1.Text);
    }

Answer 11

如何检查字符串以确保它仅包含数字，字母或空格？

Answer 12

private bool isMatch(string strValue,string specialChars)
    {
       return specialChars.Where(x => strValue.Contains(x)).Any();
    }

Answer 13

Based on @prmph's answer, it can be even more simplified (omitting the variable, using overload resolution):

yourString.Any(char.IsLetterOrDigit);

Answer 14

No special characters or empty string except hyphen

^[a-zA-Z0-9-]+$