string to digits only (was: Re: `string-to-number' 0 (was: Re: count matches in string, not region?))

[Emanuel Berg]

> [...] it reads the curly brackets as well! OK,
> question two, how do you drop everything from
> a string that isn't an integer?

This is perhaps a good way:

  (string-to-number (replace-regexp-in-string "[^0-9]" "" 
"{978-1-61262-294-1}")) ; 9781612622941

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