This may be similar to the existing request which has been out for over 3 years now. Actually looking at it there are 6 Regex requests dating back to April of 2003.
Anywho, I need Notepad++ to have capability for 0 or 1 of an item instead of just *(0 or more) and +(1 or more). Normally this is implemented with a ?.
Sets would also help, which is the topic of a few of the other outstanding Regex requests.