rex: a pedestrian regular expression operator synopsis generator

simply for your convenience:
REX prints a synopsis of the current regular expression operator syntax into the command window

>> rex

or a listbox figure

>> rex x

programmers can easily add their own, preferred stuff as simple text at the bottom of this file between two delimiters:
- edit rex
- go to the end of the file to see instructions

see:
>> help rex
for help for this rather self-explanatory snippet