Help Modifying RegEx To Return Range of Digits

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

I Z99 

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.


I A321 
I ASHG310310 




Without the quotes:

"I ([a-zA-Z\d]{2,13}) "

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