I recomend the 'Regulator' as a tool for writing and testing regular expressions. http://royo.is-a-geek.com/iserializable/regulator/ Try not! Do or do not, there is no try. - Master Yoda

Would the following work for you? Font regularFont = this.richTextBox1.Font; Font boldFont = new Font(regularFont, FontStyle.Bold); Font italicFont = new Font(regularFont, FontStyle.Italic); // instead of SelBold this.richTextBox1.SelectionFont = boldFont; // instead of SelItali this.richTextBox1.SelectionFont = italicFont; ... and so on #include "witty_sig.h"