<?php
 
$re = '~\s+Cert Hash[^:]*:\s*((?:\s*[a-z0-9]{2})+)~'; 
$str = " [staf]  NotBefore: 1/11/2016 9:48 AM\n     [staf]  NotAfter: 1/11/2024 9:48 AM\n     [staf] Subject: CN=My Root CA, O=Experian, OU=Hunter, L=Sofia, S=CA, C=BG\n     [staf] Signature matches Public Key\n     [staf] Root Certificate: Subject matches Issuer\n     [staf] Template:\n     [staf] Cert Hash(sha1): e6 c4 aa 7a 7d 11 3d c2 6c cb 6e 3f b5 bc 61 27 e8\n67 2c f7\n     [staf]   Key Container = 9c4336e8-9450-46b8-9bdc-cf70faafb29a\n     [staf]   Unique container name: 2d800c871d70eba035d4612cdd5d1a61_48982b62-3"; 
preg_match($re, $str, $match);
echo preg_replace('~\s*~', '', $match[1]);

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