Python regex remove all character except 4 digitals : <pre><code>+1511
0716
+4915 CZECHY
+3815/0616 PORT MO,
AO
_3615 USA *, SUV run on flat
+4515 PORT SUV
*, SUV
+3215 USA *, SUV
+4414
+4815 NIEM
_0616 NIEM  * / MO
+2115 NIEM J
</code></pre>

<p>I need get only first 4 digits </p>

<blockquote>
  <p>+<strong>3715</strong> NIEM</p>
</blockquote>

<p>Please help.</p>
