I am programmer PHP and maintaining a project Java I saw myself with the need to return only numbers contained in a certain String .
I did not find any questions about this in SOpt and I found it in SOen, so I bring this question here to know what is the best option, since in Java because it is a lower level language, everything or almost everything does difference in processing and can always be optimized ...
An example of what I'm requesting:
String cnpj = "83.411.122/0001-06";
The expected return:
"83411122000106"