Ruby Regex to round trailing zeros

Question

I'm looking for a regex to remove trailing zeros from decimal numbers. It should return the following results:

0.0002300 -> 0.00023
10.002300 -> 10.0023
100.0     -> 100
1000      -> 1000
0.0       -> 0
0         -> 0

Basically, it should remove trailing zeros and trailing decimal point if the fraction part is 0. It should also return 0 when that's the value. Any thoughts? thanks.