GREP expression to remove trailing zeros?

Hi,

I have to find and change multiple entries of trailing zeros. Please find sample below to understand type entries need to be change.

1.00              -> 1

0.01200         -> 0.12

4.50              -> 4.5

0.0040           -> 0.004

Please help me how can i use grep to find and change in CS6

Thanks in Advance.

Sanjay