Need help creating complex linetypes

I'm having problems creating complex linetypes containing text strings (i.e. ---OHE---OHE---OHE---). From Help, I've read that the syntax for the text object is ["string", style_name], but when I try to enter that in the Linetype definition box, it doesn't work. When I hit the [ key, the cursor jumps back to the beginning of the string, and won't enter the [. The same thing happens if I try to enter quotation marks. I'm sure it must be something simple I'm missing, can anyone point me in the right direction? Thanks!