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run code in 150+ php & hhvm versions
Bugs & Features
<?php $text = ' sdfsdaf sdafadsf #test sdfdsf'; $text = preg_replace('%(\A#(\w|(\p{L}\p{M}?)|-)+\b)|((?<=\s)#(\w|(\p{L}\p{M}?)|-)+\b)|((?<=\[)#.+?(?=\]))%u', '<a class="hashtag" href="https://google.com/?q='.urlencode('$4').'" target="_blank">$4</a>', $text, 10); echo ($text);
Output for 4.4.0 - 4.4.9, 5.0.5 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
sdfsdaf sdafadsf <a class="hashtag" href="https://google.com/?q=%244" target="_blank">#test</a> sdfdsf
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.11, 5.0.0 - 5.0.4
Warning: preg_replace(): Compilation failed: PCRE does not support \L, \l, \N, \P, \p, \U, \u, or \X at offset 10 in /in/6p9jI on line 6
Output for 4.3.0 - 4.3.10
Warning: Compilation failed: PCRE does not support \L, \l, \N, \P, \p, \U, \u, or \X at offset 10 in /in/6p9jI on line 6