Are you looking for a dynamic link that actually opens a search engine, enters your search and gives you the actual url or are you looking for something static in a message? Example of a static message:
Code:
on *:text:!search &:#: { 
var %search $2
msg # www.example.com/usersearch& $+ %search $+ /blabla=b
}

Nillens @ irc.twitch.tv
Nillen @ irc.rizon.net