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@ 2014-01-26T21:41:43Z

<?php

function replace_not_entities($search, $replace, $subject) {
    return preg_replace_callback('/&[^;]+;|(' . preg_quote($search) . ')/', function($match) use($replace) {
        return isset($match[1]) ? $replace : $match[0];
    }, $subject);
}

print replace_not_entities('um', '__', 'R&auml;ume');

Output
Performance
VLD
References
Branches

preg_replace_callback: documentation ( source)
preg_quote: documentation ( source)

preferences:dark modelive preview

61.34 ms | 402 KiB | 5 Q