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<?php echo preg_match_all('/.*@\{([a-zA-Z_-0-9]+)\}.*/', "budget_percent.@{adcampaign_adcampaign00_id}", $matches);
Output for 4.3.11 - 7.1.0
Warning: preg_match_all(): Compilation failed: range out of order in character class at offset 15 in /in/2pNI5 on line 3
Output for 4.3.0 - 4.3.10
Warning: Compilation failed: range out of order in character class at offset 15 in /in/2pNI5 on line 3