Mark Lively wrote on Tue, 13 Nov 2012 22:32:35 +0000:

>		set sometext to read lun until "def"

Up to Snow Leopard, at least, 'read' parameters like 'until' and 'using
delimiter' only use the first character of the string passed to them,
case-sensitively. The same split would be obtained with any 'until'
value beginning with a lower-case "d".

NG