In Notepad++ there is a menu option: Language->"User-Defined".
How do I customize that? What are capabilities of such option?
Can I highlight date/time? Can I highlight 21-29th symbols in the lines? Can I use RegExp?
The following npp-wiki page explains how to do that:
However, the language you need may be already defined by someone-else in User Defined Language List. You may check that list out first.