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<?php $sampleString = "<a href='{{url}}'>Link</a> <p>This text {{url}} will not get replaced</p> <a href='{{url}}' download='true'>Another Link</a>"; $regex = "/(?<=href=')()(?={{url}}.*>)/"; $replaced = preg_replace($regex, "https://myurl.com?redirect=\1", $sampleString); echo $replaced;
Output for git.master, git.master_jit, rfc.property-hooks
<a href='https://myurl.com?redirect={{url}}'>Link</a> <p>This text {{url}} will not get replaced</p> <a href='https://myurl.com?redirect={{url}}' download='true'>Another Link</a>

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