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@ 2013-06-03T10:05:33Z

<?php
$kod = ' - ';
if ( preg_match('/kód SAM(?<digit>\d{3}?)/', 'cokoliv (kód SAM123)', $matches) ) {$kod = trim($matches['digit']);}
echo $kod;

Output
Performance
VLD
References
Branches

preg_match: documentation ( source)
trim: documentation ( source)

preferences:dark modelive preview

47.11 ms | 402 KiB | 5 Q