Re: [Boost-users] [regex] ECMAScript conformance

From: Eric Niebler (eric_at_[hidden])
Date: 2007-05-30 11:40:26

John Maddock wrote:
> Armel Asselin wrote:
>> though, there are a few inconsistencies though with the ECMAScript
>> spec.
>> 1. it seems that re-matching an atom does not first clear its
>> sub-matches, as "step 4" in page 135 of ECMA 262 3rd edition tells to.
>>
>> that is, it does what is in the 'and not' part here:
>>
>> /(z)((a+)?(b+)?(c))*/.exec("zaacbbbcac")
>> which returns the array
>> ["zaacbbbcac", "z", "ac", "a", undefined, "c"]
>> and not
>> ["zaacbbbcac", "z", "ac", "a", "bbb", "c"]
> 
> I'll look into it.
> 

You might give xpressive (new in 1.34) a shot. It gets this one right.

-- 
Eric Niebler
Boost Consulting
www.boost-consulting.com