function which returns string without non-numeric characters

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C++

string

Hi,

I am looking for a function which gets a string, and returns that string without the characters which are not numeric.
for example:
when the string "A1B2C3" is givven to the function the returned value will be: "123".
I now its very simple to write it on my own, but isn't any function like that in c++ ?

Thanks,

Nir.