Regex – Duplicate HTML links and put something after it

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I have a lot of such texts: 

<a href="https://mega.co.nz/#![RandomThings1]" target="_blank">[RandomThings2] [<span style="color:#008000;">[RandomThings3]</span>]</a>

I want to transform those into this:

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<a href="https://mega.co.nz/#![RandomThings1]" target="_blank">[RandomThings2] [<span style="color:#008000;">[RandomThings3]</span>]</a> <a href="http://no.refer.co/?link=https://mega.co.nz/%23![RandomThings1]" target="_blank">NoRefer</a>

How can I do this?

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  1. Since the regex flavor in Search Regex WordPress plug-in is PHP, you can try the following regular expression that assumes you really have some arbitrary text inside square brackets ([RandomThings1]):

    (<as+[^>]*?href="[^"]*#!([.*?])"[^>]*?>[^<>]*?<span[^>]*?>[^<>]*?</span>[^<>]*?</a>)

    Replace with $1 <a href="http://no.refer.co/?link=https://mega.co.nz/%23!$2" target="_blank">NoRefer</a>.

    Here is a demo.

    PHP code:

    $re = "/(<a\s+[^>]*?href="[^"]*#!(\[.*?\])"[^>]*?>[^<>]*?<span[^>]*?>[^<>]*?<\/span>[^<>]*?<\/a>)/"; 
$subst = "$1 <a href="http://no.refer.co/?link=https://mega.co.nz/%23!$2" target="_blank">NoRefer</a>"; 
$result = preg_replace($re, $subst, $str);