irule help

I think what Edward is asking for are the specifications for the conversion. In your example, it looks like you pull the first character of the email address part that appears before the dot, followed by the first four characters of the part that appears after the dot, followed by the numbers that appear at the end of the part after the second dot. But is it always this way? Are there always a static number of digits in the email address (3), or is it variable? In other words, to do this programmatically, such as with an iRule, we have to know the rules for transformation.