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@ 2014-04-09T09:12:40Z

<?php

$string_source = 'blabla[Sun][Sun]blabla[Moon][Moon][Moon]blabla[Sun][Sun][Sun][Sun]blabla[Venus]';

$string_source = preg_replace_callback('/(\[[^[\]]+\])+/', function($matches)
{
   return $matches[1].'['.(strlen($matches[0])/strlen($matches[1])).']';
}, $string_source);

var_dump($string_source);

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
preg_replace_callback: documentation ( source)

preferences:dark modelive preview

50.98 ms | 402 KiB | 5 Q