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<?php $string = '3-6,8,12,14-20'; var_export( json_decode( '[' . preg_replace_callback( '/(\d+)-(\d+)/', fn($m) => implode(',', range($m[1], $m[2])), $string ) . ']' ) );
Output for git.master, git.master_jit, rfc.property-hooks
array ( 0 => 3, 1 => 4, 2 => 5, 3 => 6, 4 => 8, 5 => 12, 6 => 14, 7 => 15, 8 => 16, 9 => 17, 10 => 18, 11 => 19, 12 => 20, )

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