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@ 2014-10-10T15:45:36Z

<?php

$matches=array();
preg_match_all("[0-9]{3}-?[0-9]{3}","230474",$matches);
var_dump($matches);

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
preg_match_all: documentation ( source)

preferences:dark modelive preview

35.24 ms | 402 KiB | 5 Q