Are you using a version that doesnt support ()'s in $+? Because it indeed works, but if thats the case, just change the commas to $+ so it looks like: if ($calc(%x % 3) == 0) { var %return $right($1,3) $+ $chr(39) $+ %return | tokenize 32 $left($1,-3) }

Do the same with the other $+() aswell