regex help

[Thomas 'PointedEars' Lahn]

Larry Martell wrote:

> 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.

First of all, I find it unlikely that you really want to solve your problem 
with regular expressions.  Google “X-Y problem”.

Second, if you must use regular expressions, the most simple approach is to 
use backreferences.

Third, you need to show the relevant (Python) code.

<http://www.catb.org/~esr/faqs/smart-questions.html>

-- 
PointedEars

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