i rule syntax issue

HI Team,

 

I am a newbie on f5 irule..I am learning the irule thing now..One the thing i am facing issue as follows:

 

my i rule code is like this:

 

when HTTP_REQUEST { if{ [HTTP::header User-Agent]contains "iPad"} { pool pool2 } elseif{ [HTTP::header User-Agent]contains "Android"} { pool pool3 } else{ pool pool1 }

 

}

I am getting the error message like below:

 

01070151:3: Rule [/Common/acme] error: line 2: [parse error: extra characters after close-quote] [} { pool pool2 } elseif{ [HTTP::header User-Agent]contains "Android"} { pool pool3 } else{ pool pool1 } ] line 6: [parse error: extra characters after close-quote] [} { pool pool3 } else{ pool pool1 } ] line 7: [undefined procedure: pool pool3 ] [{ pool pool3 }

 

else{]

can anybody please help on this..where I am wrong on this since I have just copy paste form an existing working one..I have evaluation version of 11.3 for 90 days....the working one is lab licensed and 11.6..please help on this