note
Skeeve
<p>
So is it alway an underscore after 2 characters?
</p>
<p>
Otherwise this should do:
</p>
<code>
/^[a-z0-9_]+$/i
</code>
<!-- Node text goes above. Div tags should contain sig only -->
<div class="pmsig"><div class="pmsig-253915">
<hr><code>s$$([},&%#}/&/]+}%&{})*;#$&&s&&$^X.($'^"%]=\&(|?*{%</code>
<br><font color="red"><code>+</code></font><code>.+=%;.#_}\&"^"-+%*).}%:##%}={~=~:.")&e&&s""`$''`"e</code>
</div></div>
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