I want to division to browser type, using an iRule.

You don't need an iRule to do this. You can create an empty action in the VPE and then in the branch rules do a custom expression and search for a string in the user-agent string.

For example:

Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/48.0.2564.116 Safari/537.36

you could have an expression like

expr { [mcget { session.user.agent}] contains "Chrome" }

Then in that branch rule have the logic you want it to follow.

For IE you could have something like this:

Mozilla/5.0 (Windows NT 6.1; WOW64; Trident/7.0; AS; rv:11.0) like Gecko
Mozilla/5.0 (compatible, MSIE 11, Windows NT 6.3; Trident/7.0; rv:11.0) like Gecko

expr { [mcget { session.user.agent}] contains "MSIE" || [mcget { session.user.agent}] contains "rv:11.0" }

This should account for all versions of IE.

-Seth