Delete To Left of Character

[rstum2005]

Im trying to delete 4 to the left of a certain character in a richTextBox along with the character. This is what im trying to work with...

char[] trim = {')'}; 
int pos;
while ((pos = this.richTextBox1.Text.IndexOfAny (trim)) >= 0) 
				{
this.richTextBox1.Text = this.richTextBox1.Text.Remove(pos,1);
				}

I Tried changing the (pos,1) to (pos,-3) but this did not work?

For Example I need to delete these,
1)
12)
123)
1234)

 

[JurkMonkey]

string myText = this.richTextBox1.Text;

int index = myText.IndexOf(")");

string trimmed = myText.SubString(index, myText.Length - index);

 

[rstum2005]

Thanks JurkMonkey

But I used this and it works for what im doing.

for (int a=200;a>=0;a--)
{
string tr = richTextBox1.Text.ToString();
string str2 = tr.Replace(a+")","");
richTextBox1.Text=str2;
}