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int SearchPos = 0;
while (richTextBox1.Find(textBox1.Text.ToCharArray(), SearchPos) != -1)
{
this.richTextBox1.SelectionStart = richTextBox1.Find(textBox1.Text.ToCharArray(), SearchPos);
this.richTextBox1.SelectionLength = this.textBox1.Text.Length;
this.richTextBox1.SelectionColor = Color.Red;
SearchPos += this.richTextBox1.SelectionStart + this.richTextBox1.SelectionLength;
if (SearchPos > richTextBox1.Text.Length)
{
break;
}
}