我需要在字符串中查找特殊字符并将其显示在C＃的标签中

Question

I need to find Characters contained in a string. anything other than AZ(lower and upper) or numbers or () or / , those are the only characters allowed.

anything else (especially à,è,ë,Ç,ç,ï and so forth )are crucial to find and display in a label.

Basically I Stored everything from a text file to a string,using streamreader. now every character other than [a-zA-z0-9]()/,need to be displayed in a label.

the text file will look something like this:

0145 Joane 5521 Maxin
0211 ChanÉ 2145 Spur
0124 Martôn 4512 btgames,

private void button1_Click(object sender, EventArgs e)
    {

        string BodyToCheck = richTextBox1.Text;

      //This is where I need coding....
  }




    private void Form1_Load(object sender, EventArgs e)
    {

        StreamReader reader = new StreamReader("C:/Users/Quinell.Struthers/Test.txt");

        string body = reader.ReadToEnd();
        reader.Close();
        reader.Dispose();

        richTextBox1.Text = body;
    }

Answer 1

好了，您可以使用正则表达式替换来删除允许的字符，然后显示标签中所有不允许的字符：

label1.Text = Regex.Replace(textBox1.Text, "(?i)[a-z0-9()/]", "");

Answer 2

public static string GetSpecialCharacters(string str) {
   StringBuilder sb = new StringBuilder();
   foreach (char c in str) {
      if (!((c >= '0' && c <= '9') || (c >= 'A' && c <= 'Z') | || (c >= 'a' && c <= 'z') | c == '.' || c == '_')) {
         sb.Append(c);
      }
   }
   return sb.ToString();
}

Answer 3

using System.Text.RegularExpressions;
using System.Linq;
var regex=new Regex("[^A-Za-z0-9()/]");
var toDisplay=string.Join("",regex.Matches(testString).OfType<Match>().Select(x=>x.Value).ToArray());

EDIT Actually Joey's answer makes it far simpler, use a replace rather than grabbing all the values

using System.Text.RegularExpressions;

var regex=new Regex("[A-Za-z0-9()/]");
var toDisplay=regex.Replace(testString,string.Empty);

EDIT: Description of method 2

The first using needs to be at the top of your file, just like other usings.

The next line creates a Regular Expression object Regex on MSDN

This regular expression will match any character that is in the range AZ , az or 0-9 and additional would match ( , ) and / .

Finally the variable toDisplay is set to be the result of replacing all these matches with the empty string (effectively deleting them from the result). testString is the source string you wish to filter. The code does not alter the source string merely sets toDisplay to be the result of the filter.