@ 2014-04-29T16:31:07Z <?php
$str = "This is <a href=\"http://foo.com\">This is #foo</a>.\nSimple #html-stuff text <a href=\"http://foobar.com#baz\">#simple</a>. \n<span class=\"simple\">simple #simple text text</span>";
$str = preg_replace('/(?!<a[^<>]*>[^#]+)#(\b[-_\w]+\b)(?![^<]*<\/a>)/', '<a href="/tags/$1">#$1</a>', $str);
echo $str;
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Output for 4.3.0 - 4.3.11 , 4.4.0 - 4.4.9 , 5.0.0 - 5.0.5 , 5.1.0 - 5.1.6 , 5.2.0 - 5.2.17 , 5.3.0 - 5.3.29 , 5.4.0 - 5.4.45 , 5.5.0 - 5.5.35 , 5.6.0 - 5.6.28 , 7.0.0 - 7.0.20 , 7.1.0 - 7.1.33 , 7.2.0 - 7.2.33 , 7.3.0 - 7.3.33 , 7.4.0 - 7.4.33 , 8.0.0 - 8.0.30 , 8.1.0 - 8.1.28 , 8.2.0 - 8.2.18 , 8.3.0 - 8.3.6 This is <a href="http://foo.com">This is #foo</a>.
Simple <a href="/tags/html-stuff">#html-stuff</a> text <a href="http://foobar.com#baz">#simple</a>.
<span class="simple">simple <a href="/tags/simple">#simple</a> text text</span> preferences:dark mode live preview
254.07 ms | 406 KiB | 373 Q