C＃如果字符串包含

Question

I'm working in C# and I have 2 textboxes. If the user enters text in the first box and presses a button the text copy's into text box 2. I've now made another text box and I'm wanting it to show all the strings that contain @ if the user has entered them.
For example,
User enters "Hi there @joey, i'm with @Kat and @Max"
Presses button
"Hi there @joey, i'm with @Kat and @Max" appears in textbox 2
and @joey @Kat @Max appear in text box 3.

Just not sure how i'd do the last part.
Any help thanks! ............................................................................................. Okay, so I decided to go of and try to learn how to do this, I've got this so far

string s = inputBx.Text;
             int i = s.IndexOf('@');

            string f = s.Substring(i);
            usernameBx.Text = (f);

This works however it prints all the words after the word with the @ symbol. So like if I was to enter "Hi there @joey what you doing with @kat" it would print @joey what you doing with @kat instead of just @joey and @kat.

Answer 1

我将字符串拆分成一个数组然后使用string.contains获取包含@符号的项目。

Answer 2

A simple RegEx to find words that begin with @ should be sufficient:

string myString = "Hi there @joey, i'm with @Kat and @Max";
MatchCollection myWords = Regex.Matches(myString, @"\B@\w+");
List<string> myNames = new List<string>();

foreach(Match match in myWords) {
    myNames.add(match.Value);
}

Answer 3

var indexOfRequiredText = this.textBox.Text.IndexOf("@");

if(indexOfRequiredText > -1)
{
    // It contains the text you want
}

Answer 4

You could use regular expressions to find the words you search for.

Try this regex

@\w+

Answer 5

Maybe not the neatest soultion. But something like this:

string str="Hi there @joey, i'm with @Kat and @Max";
var outout= string.Join(" ", str
               .Split(' ')
               .Where (s =>s.StartsWith("@"))
               .Select (s =>s.Replace(',',' ').Trim()
            ));

Answer 6

A Regex would work well here :

var names = Regex.Matches ( "Hi there @joey, i'm with @Kat and @Max", @"@\w+" );

foreach ( Match name in names )
    textBox3.Text += name.Value;