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@ 2016-08-02T22:01:39Z

<?php

$data = <<< 'TEXT'
edit 2
        set dst 10.23.255.252 255.255.255.252
        set device "abc"
        set comment "Static Route site-5552"
TEXT;

$match=[];
preg_match('/set dst ([\d\.]+).*site-5552/s',$data,$match);

echo $match[1];

Output
Performance
VLD
References
Branches

preg_match: documentation ( source)

preferences:dark modelive previewkey bindings

34.9 ms | 404 KiB | 5 Q