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<?php var_dump( preg_replace('/[^A-Za-z0-9_\.\(\)]+/', '', trim('( if( refund.tr_refund_date IS NULL, 1, 0 ) ) DESC, refund.tr_refund_date')) );
Output for git.master, git.master_jit, rfc.property-hooks
string(60) "(if(refund.tr_refund_dateISNULL10))DESCrefund.tr_refund_date"

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