(C#) remove everything after a specific character in the textbox1.text multiline ?

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Hello everyone.
I wanted to remove everything after a specific character in each row in textBox1.Text multiline.
This below is the code for remove everything after specific character, but for textBox single line:
How to do it for textBox multiline?

For example,
before executing the code:

www.page.1.com/page.2/page.3
www.home.page.net/about.page
www.samepage.org/
www.text1.com/text2

I want it to look like this after executing the code:

www.page.1.com
www.home.page.net
www.samepage.org
www.text1.com

Thank you.

What I have tried:

C#

string str = textBox1.Text;
            if (str.Contains('/'))
            {
                int index = str.IndexOf('/');
                string result = str.Substring(0, index);
                textBox1.Text = result;
            }

Posted 11-Feb-20 3:34am

Member 10410972

Updated 11-Feb-20 4:01am

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Pete O'Hanlon · Answer 1 · 2020-02-11T03:53:00

Solution 1

What you could do is loop over the Lines property and do something like this:

C#

for (int i=0; i < textBox1.Lines.Length; i++)
{
  string line = textBox1.Lines[i];
  if (line.Contains('/'))
  {
     int index = line.IndexOf('/');
     textBox1.Lines[i] = line.Substring(0, index);
  }
}

Posted 11-Feb-20 3:53am

Pete O'Hanlon

Comments

Maciej Los 11-Feb-20 14:49pm

5ed!

Pete O'Hanlon 11-Feb-20 15:43pm

Thanks.

TheRealSteveJudge 12-Feb-20 2:34am

Short but effective solution for Windows Forms. 5*

Pete O'Hanlon 12-Feb-20 3:00am

Thanks.

TheRealSteveJudge · Answer 2 · 2020-02-11T04:02:00

First of all you must split the TextBox text into separate lines.
When you watch the TextBox text property with the debugger,
you will see that it actually is like this:

http://www.page.1.com/page.2/page.3\r\nwww.home.page.net/about.page"...

The linebreaks are \r\n

You get the lines like this

C#

var lines = Regex.Split(textBox.Text, "\r\n");

Now you must loop through the lines and get the first part of any URL by using String.Split:

C#

var newLines = new List<string>();

foreach (var line in lines)
{
    var firstChunk = line.Split('/')[0];

    newLines.Add(firstChunk);
}

Finally you must join the lines with the linebreaks.

C#

textBox.Text = string.Join("\r\n", newLines);