; Reverse a string.
; Usage :
;   /reverse How are you ?
;   //echo 4 -a $reverse(How are you ?)
alias reverse {
  var %result = $regsubex($1-, /^(.{0, $+ $floor($calc($len($1-) / 2 - 1)) $+ }[^ ])( *)(.*)$/, $+($reverse(\3), \2, $reverse(\1)))
  if ($isid) return %result
  echo 6 -a * Reversed: %result
}