private function _setupMemcacheKeyVariables($pattern)
{
preg_match_all('/\\{(\\w+)\\}/', $pattern, $matches, PREG_SET_ORDER | PREG_OFFSET_CAPTURE);
$variables = array();
foreach ($matches as $match) {
$variableName = $match[1][0];
if (\array_key_exists($variableName, $variables)) {
throw MemcacheCollectionException::duplicatePatternParameter($pattern, $variableName);
}
$variables[$variableName] = array('pattern' => $match[0][0], 'replace_string' => $match[0][0], 'start_offset' => $match[0][1]);
}
return $variables;
}
