php - how to replace ... between a word where one part is numeric the other is'int?

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how can i put a space between a word where one part is numeric the other is'int? like so:

$string = "this is a 2000px height photo";
$string = preg_replace('???',' //1',$string);
echo $string; //this is a 2000 px height photo

can someone help me? thanks!

$string = preg_replace('/(\d+)([[:alpha:]]+)/', '$1 $2', $string);

\d+ matches any digit
[[:alpha:]]+ matches any letter (\w+ is wrong because matches letters and digits: thepreg_replace() call splits numbers - e.g. '100' becomes '10 0')

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