 
 
You can use these primitives to manipulate strings (in the argument field of GASP statements):
.LEN("str")
"str", as an absolute
expression.  For example, `.RES.B .LEN("sample")' reserves six
bytes of memory.
.INSTR("string", "seg", ix)
.INSTR("ABCDEFG", "CDE", 0)' evaluates
to the absolute result 2.
The result is -1 if seg does not occur in string
after position ix.
.SUBSTR("string",start,len)
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