3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?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;
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
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>