Question to syntax highlighting

[David, Patrick (I/EG-711)]

Hello out there,

I use nedit to work on input files for the software ABAQUS (a finite
element solver).
I want to teach my nedit to highlight different keywords in a
non-case-sensitive way. For example the words "step" shall be
highlighted independet of upper or lower cases. So "Step" is also a
valid keyword as "step" or "STEP" or "sTep" or ...

I am not very familiar with regex so I have my problems with it. Can you
help me to build it? I hope for a simple solutions becaus my list of
keywords is long... 

hfh
Greetings from
Patrick