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@ 2015-04-06T11:03:49Z

<?php
	echo preg_replace('/(?:\w+)(__)(?:\w+)/i', '$1.$3', 'aluno_pobre__casado__novata');

?>

Output
Performance
VLD
References
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preg_replace: documentation ( source)

preferences:dark modelive preview

32.94 ms | 402 KiB | 5 Q