how can I do the preg_match to a string with space?
<p>I need to preg_match a string "a 1" 
but I only know how to preg_match "a1"</p>

<pre><code>preg_match('{^a\d+$}',$k))
</code></pre>

<p>Can anyone tell me how to do it when the string have a space?</p>
