paste

( TEST( A()(B(C))) () )

([A-Z_][A-Z0-9_]*[$#%]?[ \t]*(?:\[\])?|".*?"|@[A-Z0-9_]+|)[ \t]*{(.*?):(.*?)}?
[A-Za-z0-9_]+[$#%]? *(?:\[\])? *{.*?:.*?}
A${B:C} -> GETRANGE(A,B,C) -> MID$(A,B,C-B) or GETBITS(A,B,C-B)
A7$[2]{B:C}
"ABC"{B:C}
@ABC{B:C}
6{B:C}

***
([A-Z_][A-Z0-9_]*[$#%]?|".*?"|@[A-Z0-9_]+)[ \t]*{(.*?):(.*?)}


if A-Za-z_
 eat following A-Za-z0-9_
 eat $#%
 eat [...]

([A-Z_][A-Z0-9_]*[$#%]?[ \t]*(?:\[\])?)[ \t]*{(.*?):(.*?)}[ \t]*=
A{B:C}= -> SETRANGE A,B,C, -> SUBSTR$ A,B,C-B, or SETBITS A,B,C-B,