Find and show multiple Line from specific text in richtextbox

Question

Based from this thread How to get the line of specific text in richtextbox I want to ask another question about line of specific text in richtextbox.

From that thread, he wanted to show which line 'orange' text on? But, i want to know if he had another 'orange' like

From that table, i want to show the line number of 'Orange' text i expected the output will be "Line 1,2,3,4"

Thank you very much.

Answer 1

You have to use a loop and keep track of the index you found the string last in. Something like this should work:

private void button1_Click(object sender, EventArgs e)
{
    string orange = "orange";
    var index = 0;
    do
    {
        index = richTextBox1.Find(orange, index, RichTextBoxFinds.None);

        if (index >= 0)
        {
            textBox1.Text += richTextBox1.GetLineFromCharIndex(index).ToString() + " ";
            index++;
        }
    } while (index >= 0);
}

This will find multiple instances of the string "orange" in different lines.