You could create an f key alias, that does something like
/run http://www.google.com.au/search?hl=en&q=clipboard+contents+with+space+replaced+with+pluses+and+punctuation+removed
You can use $cb / $cb(n) to reference the clipboard contents.. from help file.
$cb
Returns the first 256 characters of the clipboard contents.
$cb(N)
Returns $crlf delimited lines from text currently in the clipboard.
Properties: len
$cb(0) returns the number of lines in the clipboard
$cb(0).len return the total length of all lines in the clipboard
$cb(1) returns line 1 from the clipboard
$cb(1).len returns the length of line 1
Then you would just highlight something, and press the f key you assigned.