      "Char"  
 "Str",     ().
***    (  ), 
 LPOS ~Vname... (. conty9)
================================================================================

RPOS[*] [*] [-case] [[*][~][VName][, [~]LName]=Char, Num, Str //prefix* for many

*	,   VName
~	     (  )
VName	      
-case	    (  ""  ""   )
Str	     ,     
Char	 ,   ,    
	.       .
	   ", ",     =. 
Num	 ,     (  ) ,
	(1 - , 3 - ).  - 1
RPOS*	   ,  "="  ", ",   
	   
--------------------------------------------------------------------------------
   "Num"<1,         ,
,      4;    0,
,    .
       Unicode.     ",".

******************************************************************[]*****
RPOS iPos=a,2,123A56|1234A6|abcdef  //   "123A56|1234A6|abcdef"   "a",  iPos=12
RPOS ~iPos=a,-1,123A56|1234A6|abcdef  //   "123A56|1234A6|abcdef"   "a",  iPos=4
RPOS -case iPos=a,2,123A56|1a234A6|abcdef //  "" (  ),  iPos=9