regex halp

can anyone help with the following regex?
[0 or more whitespace characters] + #define + [1 or more whitespace characters] + NULL + [1 or more whitespace characters]

thank u

>>7
U MENA

$ grep '\[0 or more whitespace characters] \+ #define \+ \[1 or more whitespace characters\] \+ NULL \+ \[1 or more whitespace characters\]' file.c

?