$re = '/^\$SHA\$([a-f0-9]+)\$([a-f0-9]+)$/';
$str = '$SHA$7b11fd7c3568e2cf$2e0380db347bbc210bb10c117dbcb7a7fdba831513eec387666571c7a3ca051e';
preg_match_all($re, $str, $matches, PREG_SET_ORDER, 0);
// Print the entire match result
var_dump($matches);
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for PHP, please visit: http://php.net/manual/en/ref.pcre.php