Rockwell Automation 1746-BAS BASIC LANGUAGE - Manual (Page 248)

Publication 1746-RM001A-US-P
15-6 String Functions
CALL 64 – Find a String
in a String Purpose
Use CALL 64 to find a string within a string. It locates the first occurrence
(position) of this string. This CALL has two input arguments. The first is the string
to be found, the second is the string searched for a match. One output argument is
required. If the number is not zero then a match was located at the position
indicated by the value of the output argument. This routine is similar to the BASIC
INSTR$(findstr$,str$) (example:
L=INSTR$($(1),$(2) ).
Syntax
PUSH [string number to be found]
PUSH [base string number]
CALL 64
POP [match position]
Example
>1 REM EXAMPLE PROGRAM
>10 REM SAMPLE FIND STRING IN STRING ROUTINE
>20 STRING 100,20
>30 $(1) = “456”
>40 $(2) = “12345678”
>50 PUSH 1 : REM STRING NUMBER OF STRING TO BE FOUND
>60 PUSH 2 : REM BASE STRING NUMBER
>70 CALL 64 : REM GET THE LOCATION OF FIRST CHARACTER
>80 POP L
>90 IF (L=0) THEN PRINT “NOT FOUND”
>100 IF(L>0) THEN PRINT “FOUND AT LOCATION”,L
>110 END
READY
>RUN
FOUND AT LOCATION 4
READY
>