preg_match white space
<p>I would like to ask you about regular expressions preg_match have outlined below. I wish to express their approval to add white space. For one and the other expression. I know that white space is represented by a /s But I can not deal with it. please help</p>

<pre><code>    'string' =&gt; array(
        'pattern' =&gt; '^([a-zA-Z ]+)$',
    ),

    'numericString' =&gt; array(
        'pattern' =&gt; '^[a-zA-Z0-9]+$',
    )

    'numeric' =&gt; array(
        'pattern' =&gt; '^[0-9]+$',
    ),
</code></pre>

<p>Please help i need add white space to any.</p>
