OsFormatString
From OpenSimulator
string osFormatString(string format,list params)
// //osFormatString example, by Tom Earth. // default { state_entry() { string to_format = "My name is {0}. My owner is {1}. I am in the sim {2}"; list format = [llGetObjectName(),llKey2Name(llGetOwner()),llGetRegionName()]; llOwnerSay(osFormatString(to_format, format)); } }