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@ 2013-10-06T21:30:55Z

<?php
$a = '1-1,2+2';
if (!preg_match('/^\d\-$/', $a)) {
    die('Invalid Request');
}
echo 'ok';

Output
Performance
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preg_match: documentation ( source)

preferences:dark modelive preview

36.02 ms | 402 KiB | 5 Q