php - Sanitize all except number, forward slash and $? -

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i have entry form 'price', , want like:

$250 full price /$230 booking

to sanitized within database to:

250/230

or 

$250/$230

is possible either in php?

i've tried:

$formdata = ( isset( $_post['price-entry'] ) ? sanitize_html_class( $_post['price-entry'] ) : '' );

but strips except letters , digits.

try 

  $price = '$250 full price /$230 booking';   echo get_clean_price($price);    function get_clean_price($price) {     return preg_replace("/[^\d\/]+/", "", $price);   }

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