stripping out all characters from a string, leaving numbers

Question

Hay, i have a string like this:

v8gn5.8gnr4nggb58gng.g95h58g.n48fn49t.t8t8t57

I want to strip out all the characters leaving just numbers (

Answer 1

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

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

Answer 2

To satisfy my curiosity I asked about the speed of the proposed answers and as shown in preg_replace speed optimisation/ it is (much) faster to use str_replace() than preg_replace().

So you might want to use str_replace() instead.

Answer 3

preg_replace('/[^0-9.]/', '', $string);

Answer 4

$input = 'some str1ng 234';
$newString = preg_replace("/[^0-9.]/", '', $input);