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@ 2016-08-22T16:14:41Z

<?php

$input = <<<STR
<p>{{ myFunction()&nbsp; }}</p>    
<p>&nbsp;</p>    
<p>{{ number|number_format(2, "&nbsp;.&nbsp;", '&nbsp;,&nbsp;')&nbsp;}}</p>    
<p>{% set myVariable = '&nbsp;&nbsp;' %}</p>
STR;

echo preg_replace('/&nbsp;(?=(?:(?!{[{%]).)*[%}]})/', ' ', $input);

Output
Performance
VLD
References
Branches

preg_replace: documentation ( source)

preferences:dark modelive previewkey bindings

43.85 ms | 404 KiB | 5 Q