Multilined RichTextBox

I have a coming back problem that I dont know how to get out from.
If you put this code in the event handler for a richtextBox control and write this on the First line:
1234567890 //This will turn red when you press 0

If you instead right away press enter so you come to the second line in the multilined textBox and write this:
123456789 //Then this will turn red when you press 9

So it seems that it uses the /n next line character as a character.

What I wonder is how this is possible to to solve as I want the code to only count the characters on the current line where the cursor is, so it would be: 1234567890 for all lines.

I use this code in the richtextBox event handler:

Code:

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int positionen = 0;
positionen = richtextBox1->SelectionStart;

if ( richtextBox1->SelectionStart >= 10 )
{
this->richtextBox1->Select((positionen - 10), positionen);
this->richtextBox1->SelectionColor = Color::Red;
this->richtextBox1->DeselectAll();
this->richtextBox1->SelectionStart = positionen;
}

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could you get selection text and look for newline character in it - and if found - exit event handler?

Yes I can get the selected text like this.
I am not sure how or if the newline character could be indicated and how it could be a solution.
I have put a messagebox to show what text that is selected. If putting this code inside a richTextBox1 eventhandler and after that write these 2 lines in the box and important start with the second line first and then write the first line.

123456 hello

123456789


When you have written the word: hello then this will be selected and turn blue:
hello

12345

I wonder how this can be prevented as I only trying to select ´hello´ ?

Code:

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int positionen = 0;
positionen = richTextBox1->SelectionStart;
char one, two, three, four, five;
                       
if ( richTextBox1->SelectionStart >= 1 ) { one = richTextBox1->Text[positionen - 1];}
if ( richTextBox1->SelectionStart >= 2 ) { two = richTextBox1->Text[positionen - 2];}
if ( richTextBox1->SelectionStart >= 3 ) { three = richTextBox1->Text[positionen - 3];}
if ( richTextBox1->SelectionStart >= 4 ) { four = richTextBox1->Text[positionen - 4];}
if ( richTextBox1->SelectionStart >= 5 ) { five = richTextBox1->Text[positionen - 5];}
                       
       
if ( richTextBox1->SelectionStart >= 5 )
{
        if( one == 'o' && two == 'l' && three == 'l' && four == 'e' && five == 'h' )
        {
                this->richTextBox1->Select((positionen - 5), positionen);
                this->richTextBox1->SelectionColor = Color::Blue;
                       
                MessageBox::Show(this->richTextBox1->SelectedText);
        }
}

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I did find the problem, I think. To change this line:

Code:

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this->richTextBox1->Select((positionen - 5), 5);

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