What is the difference between Verify & Index in PL/1?

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What is the difference between Verify & Index in PL/1?..

VERIFY
Indicates the position in string x of the first character thats not in string y. if all r there it returns 0

example: VERIFY(SAM,SAM)returns 0
VERIFY(ABCD,EREE) returns 1

INDEX
Returns the starting position of the string y within x; returns 0 if y is not there in x

example: index(sam,agt) returns 2
index(sam,dog) returns 0

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What is the difference between Verify & Index in PL/1?..

Answer / kanishk kumar

INDEX::
Returns the starting position of the string y within string
x; returns 0 if y not present in x.

>>--INDEX--(--x--,--y--)------------------------------------
------------><

Verify::
Returns the first position in string 1 where any element in
string 2 is not in string 1.

If all characters in x are
contained in y, result is zero.

>>--VERIFY--(--x--,--y--)-----------------------------------
------------><
Example: IF VERIFY(NAME,ALPHABET) THEN...;

DCL MAINSTR CHAR(6) INIT ('ANUK ');
DCL SUBSTRG CHAR(2) INIT ('NA');
RTN = VERIFY(MAINSTR, SUBSTRG);

Default search starts from 1st position.
RTN=3