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  1. <?php
  2.  
  3. $re = '~(?<!{){{{(?!{)\s*(.*?)\s*(?<!})}}}(?!})~'; 
  4. $str = "{{{ hello{{there}} }}} {{{good {{morning}} }}}"; 
  5. preg_match_all($re, $str, $matches);
  6. print_r($matches[1]);
Success #stdin #stdout 0.02s 52472KB
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stdin
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Standard input is empty
stdout
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Array
(
    [0] => hello{{there}}
    [1] => good {{morning}}
)
https://ideone.com/W4M2ht
language:
PHP (php 7.3.5)
created:
9 years ago
visibility:
secret

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