1 03/31/83  after, af
 2 
 3 Syntax:  af STRA STRB
 4 
 5 
 6 Syntax as active function:  [af STRA STRB]
 7 
 8 
 9 Function:  returns the string following the first occurrence of STRB in
10 STRA.  If STRB does not occur in STRA, the null string is returned.