String functions

$WBCNL
$WBCSTR
$WBFORMAT
$WBHE
$WBINDOF
$WBLEFT
$WBLEN
$WBLINDOF
$WBMID
$WBMREPL
$WBREPL
$WBRIGHT
$WBRXE
$WBRXR 
$WBTRIM