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  1. <?php
  2.  
  3. preg_match_all('~(?:[[{]*|(?!\A)\G)\K[A-G-][^A-G\]}]*~', "{A''BsCb}", $matches);
  4. print_r($matches);
Success #stdin #stdout 0.01s 52488KB
stdin
Standard input is empty
stdout
Array
(
    [0] => Array
        (
            [0] => A''
            [1] => Bs
            [2] => Cb
        )

)