How to extract numbers from a string?

Question

I have string contains a path

string=\"toto.titi.12.tata.2.abc.def\"

I want to extract only the numbers from this string.

To extrac

Answer 1

This would be easier to answer if you provided exactly the output you're looking to get. If you mean you want to get just the digits out of the string, and remove everything else, you can do this:

d@AirBox:~$ string="toto.titi.12.tata.2.abc.def"
d@AirBox:~$ echo "${string//[a-z,.]/}"
122

If you clarify a bit I may be able to help more.