Possible bug in grep

[Adam Richard]

When I run the following command:

echo "FROM" | grep -io 'from.*$'

I expect it to print the word "FROM".  But it doesn't print anything.  However, 
if I
change "FROM" to "from", it works.  So it seems like the -i flag isn't working. 
Removing the -o also makes it work, so maybe it's a combination of the 2 
options.

If this isn't a bug, could you please explain to me why the behavior isn't what 
I
expect?

I tried this with grep 2.5 and 2.5.1.  I am using Linux 2.4.21-0.13mdk with 
Mandrake
9.1.  I ran the command from bash 2.05b.0(1)-release.