<?php

$re = '/<a href[^>]*(?:(?:@|!|%|#)\w+|\{\w+\})[^>]*>\K|((?:@|!|%|#)\w+|\{\w+\})/m';
$str = 'Hello Bob @foo <a href="/someurl/!foobar/!bar">Word {foobar} </a> #foo someword #bar
<a href="/abc/d>koramamam</a>';
$subst = '<span class="notranslate">$1<\\\\span>';

//$result = str_replace('/<span class="notranslate"><\\\\span>/m',"",preg_replace($re, $subst, $str));
$result = preg_replace('/<span class="notranslate"><\\\\span>/m',"",preg_replace($re, $subst, $str));

echo $result;


?>

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