Android/Java Regex to remove extra zeros from sub-strings

Question

I have the following string as input :

\"2.0,3.00,-4.0,0.00,-0.00,0.03,2.01,0.001,-0.03,101\"

Final output will be like :

Answer 1

Using the list of numbers from your question, and some additional ones, the following regex replace will remove all leading and trailing zeros.

numbers.replaceAll("\\b0*([1-9]*[0-9]+)(\\.[0-9]*[1-9])?\\.?0*\\b", "$1$2");

with input:

2.0,3.00,-4.0,0.00,-0.00,0.03,2.01,0.001,-0.03,101,101.1010,0020.00

the result is:

2,3,-4,0,-0,0.03,2.01,0.001,-0.03,101,101.101,20

If you want to have decimals without the leading 0 then you can use the following.

numbers.replaceAll("\\b0*([0-9]+)(\\.[0-9]*[1-9])?\\.?0+\\b|0+(\\.[0-9]+?)0*\\b", "$1$2$3");

with input:

2.0,3.00,-4.0,0.00,-0.00,0.03,2.01,0.001,-0.03,101,101.1010,0020.00

the result is:

2,3,-4,0,-0,.03,2.01,.001,-.03,101,101.101,20