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

Hay, i have a string like this:

v8gn5.8gnr4nggb58gng.g95h58g.n48fn49t.t8t8t57

I want to strip out all the characters leaving just numbers (and .s)

Any ideas how to do this? Is there a function prebuilt?

thanks

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

replace substrings that do not consist of digits or . with nothing.


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