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<?php echo preg_match_all('/@\{([a-zA-Z_0-9]+)\}/', "budget_percent.@{adcampaign_adcampaign00_id}", $matches); var_dump($matches);
Output for 4.3.0 - 7.1.0
1array(2) { [0]=> array(1) { [0]=> string(29) "@{adcampaign_adcampaign00_id}" } [1]=> array(1) { [0]=> string(26) "adcampaign_adcampaign00_id" } }