Position() Bug ? In PostgreSQL 9.2

Hello Team,

I would like to know whether the following behavior is a BUG or an expected
behavior. If this is a duplicated case, then kindly ignore.

postgres=# SELECT version();
version
-------------------------------------------------------------
PostgreSQL 9.2.3, compiled by Visual C++ build 1600, 32-bit
(1 row)

postgres=# select position('P' in 'PostgreSQL');
position
----------
1
(1 row)

postgres=# select position('' in 'PostgreSQL'); *// position(Substring as
an empty string) is returning 1.*
position
----------
1
(1 row)

Kindly let me know, if anything i miss here.

Regards,
Dinesh
manojadinesh.blogspot.com