On 23 Aug 2002 at 22:29, Damian Conway wrote: > > 2) p3, "This or nothing", Have I got :, ::, and ::: straight? > > > > o : backtrack fails rule > No. Backtrack skips the preceding atom. > > > o :: backtrack fails surrounding group > Yes. > > > o ::: backtrack fails whole match > No. Backtrack fails rule.
So, would this be right short explanation: o : backtrack fails preceding atom (as atom fails, it's skipped) o :: backtrack fails surrounding group (OK) o ::: backtrack fails rule (OK) o <commit> backtrack fails whole match So even shorter version: :/::/:::/<commit> makes backtrack fail current atom/group/rule/match. -- Markus Laire 'malaire' <[EMAIL PROTECTED]>
