After SET X="dpbsmith@world.std.com" SET $P(X,"@",1)="office" causes X to become "office@world.std.com" (note that $P is equivalent to $PIECE and could be written as such).
بعد SET X="dpbsmith@world.std.com" $PIECE("world.std.com",".",2) تحقق yields "std" SET $P(X,"@",1)="office" وتؤدي إلى أن تصبح Xما يلي "office@world.std.com" (لاحظ أن $P تكافئ $PIECE، ويمكن أن تكتب هكذا).