iRule Help - Capture URI, Modify, and Redirect

Devcentral ate and destroyed my previous account so posting under this account. This is a final working version. Note the asterisks in the lines with scan commands. They can be hard to pick out of there. This article helped greatly in getting this to work: Revisiting the Scan Command.

when HTTP_REQUEST {
set URI [string tolower [HTTP::uri]]
 if { $URI equals "/" or $URI equals ""} {
   HTTP::respond 301 Location "https://My.site.org/mysite"
 } elseif { $URI contains "find-a-thing1" and $URI contains "thing1detail" } {
       scan $URI {/%*[^/]/%*[^/]/%*[^/]/%*[^/]/%[^/]/%*[^/]/} a
   HTTP::respond 301 Location "https://diff.site.org/thing1/$a"
} elseif { $URI contains "find-a-thing"} {
   HTTP::respond 301 Location "https://diff.site.org/thing1"
 } elseif { $URI contains "find-a-thing2" and $URI contains "thing2detail"} {
     scan $URI {/%*[^/]/%*[^/]/%*[^/]/%*[^/]/%[^/]/%[^/]/} b c
   HTTP::respond 301 Location "https://diff.site.org/thing2/$b/$c"
 } elseif { $URI contains "find-a-thing2"} {
   HTTP::respond 301 Location "https://diff.site.org/thing2"
}
}