Remove ports from URL's

Try using:

when HTTP_REQUEST {
  switch -glob [string tolower [HTTP::host]] {
 "www.company.com*"      { pool company.com_www }
 "www2.company.com*"     { pool company.com_www2 }
 "www3.company.com*"     { pool company.com_www3 }
 "www4.company.com*"     { pool company.com_www4 } 
 }
}