Help

[francesco viscomi]

I'm a beginning in the world of Linux, and I have a little problem with the 
grep utility,
infact the following regular expression doesn't work and I cannot understand 
why. The expression is:
^A.*\.$
It should find all line that start with an A and end with a .
Could you help me.
Thank I find Linux so much beatiful.
Excuse me if my English isn't perfect!