preg_replace to allow only numbers.

[Artie_J]

I thought it was supposed to work like so:

$string contains letters, numbers, spaces, dashes, whatever...
$result = preg_replace("[^0-9]","", $string);
$result should only contain the numbers.
If it's not a 0-9, replace it with "".
Yes? No? Syntactical error?
Thanks!

[RonPK]

You need to use pattern delimiters:

$result = preg_replace("/[^0-9]/","", $string);

[Artie_J]

My forehead is getting sore. :)

Thank you Ron!