On Wed, Jun 19, 2013 at 03:02:32PM +0100, gvim wrote: > On 19/06/13 14:52, Abigail wrote: > > > That's not a lookahead assertion. > > So there's a typo on p.248 Yes, and it's listed in the errata on the publisher's Web site: http://oreilly.com/catalog/errata.csp?isbn=9780596004927 Tom