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@ 2017-08-23T19:37:48Z

<?php
$s = "Re: Re: Re: Re: Re: Re: Re: Re: Prueba";
$s =preg_replace("/(Re: ?){2,}/i", "Re: ", $s);
var_dump($s);

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
preg_replace: documentation ( source)

preferences:dark modelive preview

57.59 ms | 402 KiB | 5 Q