regex help

[Larry Martell]

I need to remove all trailing zeros to the right of the decimal point,
but leave one zero if it's whole number. For example, if I have this:

14S,5.0000000000000000,4.56862745000000,3.7272727272727271,3.3947368421052630,5.7307692307692308,5.7547169811320753,4.9423076923076925,5.7884615384615383,5.137254901960000

I want to end up with:

14S,5.0,4.56862745,3.7272727272727271,3.394736842105263,5.7307692307692308,5.7547169811320753,4.9423076923076925,5.7884615384615383,5.13725490196

I have a regex to remove the zeros:

'0+[,$]', ''

But I can't figure out how to get the 5.0000000000000000 to be 5.0.
I've been messing with the negative lookbehind, but I haven't found
one that works for this.