Syntax highlighting a RichTextBox in C#

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C#

.NET

syntax

RichTextBox

I have some code that should color some text in a richtextbox, currently what it should do, is character by character color every word in the richtextbox, but it leaves some characters still black at the end for some reason.

This is the timer1 tick method

private void timer1_Tick(object sender, EventArgs e)
        {
            foreach (RichTextBox rtb in Editor.Values)
            {
                int pos = 0;
                foreach(string ln in rtb.Lines)
                {
                    Color[] Syntax = EditorTools.ParseString(ln);
                    int cur = 0;
                    foreach (char chr in ln)
                    {
                        rtb.SelectionStart = pos;
                        rtb.SelectionLength = 1;
                        rtb.SelectionColor = Syntax[cur];
                        cur++;
                        pos++;
                    }
                }
            }
        }

And this is the ParseString method which returns a Color array

public static Color[]ParseString(string raw)
        {
            int len = 0;
            foreach(char chr in raw)
            {
                len++;
            }
            Color[] ret = new Color[len];
            string[] parsed = Regex.Split(raw, " ");
            for (int i = 0;i < len;i++)
            {
                ret[i] = Color.Green;
            }
            return ret;
        }