<p>Need to an expression that returns only things with an "I" followed by either a "J" or a "V" (No Quotes) and then a minimum of 1 number up to 3 numbers.</p>

<p>I J### <br />
I V### <br />
I J## <br />
I V## <br />
I J# <br />
I v# <br /></p>

Depends on your flavor
```
```
I(J|V)[0-9]{1,3}
```
```
Do you also need a space after an "I"?
```
```
I (J|V)[0-9]{1,3}
```
```