php - stripping out all characters from a string, leaving numbers -

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Hey, I have such a string: 

  v8gn5.8gnr4nggb58gng.g95h58g N48fn49t .t8t8t57

I just want to leave all the numbers (and .s)

How to do any idea? Is there a function prebilt?

Thanks

$ str = preg_replace ('/ [^ 0-9. ] + / ',' ', $ Str);

Replace the substrings that are not with the digits or not. nothing.


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