Strip anything after and including first instance of non letter
<p>Is it possible using PHP to strip everything from a string after and including the first 'non' letter? </p>

<p>E.g.</p>

<p><code>Blue Bayou (1954)</code> becomes <code>Blue Bayou</code></p>

<p><code>Hello World: 1234</code> becomes <code>Hello World</code></p>
