<p>Currently this expression <code>"I ([a-zA-z]\d]{3} "</code> returns when the following pattern is true:</p>

<pre>
I AAA 
I Z99 
</pre>

<p>I need to modify this so it will return a range of alphanumerics after the I from 2 to 13 that do not have a space.</p>

<p>Example:</p>

<pre>
I AAA 
I A321 
I ASHG310310 
</pre>

<p>Thanks,</p>

<p>Dave</p>

Without the quotes:
```
"I ([a-zA-Z\d]{2,13}) "
```