[filburt1]

Well after reading the docs they happened to have a regex string defining a variable, so I wrote this (ignore the junk about removing the $s):

PHP Code:

function getvarnames($s, $includedollarsign = false)
// Returns all the variable names from $s, and, if $includedollarsign is true then
// they are all prefixed with a $.
{
    preg_match_all("'\\$[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*'", $s, $a);
    $s = array_unique($a);
    if (!$includedollarsign) array_walk($a, "stripleadingcharall");
    return $a;
} 


Does it look like that works fine? It seems to in my test but I want to make sure it works for all conditions.