regular expression for matching number and spaces

i want to create a regular expression which will all开发者_运维问答ow only spaces and number..

And how can i check this with PHP?

$pattern = '/^[0-9 ]+$/';

if ( preg_match ($pattern, $text) )
{
    echo 'allowed';
}

Edit:

If you want to limit to 15 chars (as you mentioned in a comment) you can use { } to delimit a min and a max lenght.

pattern becomes :

$pattern = '/^[0-9 ]{1,15}$/';

to allow 1 to 15 chars.

The regex is as follows.

/^[\d ]+$/i

To answer how you run it in php, I need to know the context, do you need it to run on a single line or multi line input? do you need it to run in a loop?

This should work:

^[\s\d]*$

You should probably specify if you want "zero or more" or "one or more" spaces. The above allows for an empty string to pass evaluation.