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@ 2013-11-04T12:32:30Z

<?php

$string="1001-sdfjh";
$matches=array();

preg_match("/^\d{4}/", $string, $matches);

print_r($matches);

?>

Output
Performance
VLD
References
Branches

preg_match: documentation ( source)
print_r: documentation ( source)

preferences:dark modelive preview

32.61 ms | 402 KiB | 5 Q