Remove all non digit characters

[xxarmoxx]

How can I take a string and remove all non digit characters from the string? Unfortunately my regex skills arent so hot

[xxarmoxx]

This seems to be working well:

	$str = "1234567890abc!@#$&#37;^&*()-=_+[]{}|\\'\"?/><,.";
	echo preg_replace("%[^0-9]%", "", $str);

Any objections?

[penagate]

No objections. You can use \d as well as 0-9.

[xxarmoxx]

how do i turn this into a preg_match?

I need to match if a string is all digits, if so true else false

[kows]

    if(preg_match('/^\d+$/', $str)){
      echo "matched!\n";
    }else{
      echo "no match.\n";
    }