grep command

Hi Everyone,

I haven't been able to figure out why it gives output like this?.
Would appreciate some assistant please!

-bash-3.2$ cat samplefile
big
bad bug
bag
bigger
boogy
be
bi
b2
2b
-bash-3.2$ grep 'ggg*' samplefile
bigger

Thanks,

Quang

 *      The preceding item will be matched zero or more times.

I see what you're saying. Thanks for quickly respond.

Quang