Re: [boost] [regex] nested negated character classes

From: Eric Niebler (eric_at_[hidden])
Date: 2005-06-14 10:04:51

John Maddock wrote:
>>The following trivial pattern:
>>
>>    boost::regex pat("[\\D]");
>>
>>throws an "Invalid or trailing backslash" exception.
> 
> 
> Yes, known problem, don't know how to fix it easily either 

I peeked at your code. For narrow characters, you can easily merge the 
negated character class into the re_set.map_[256]. For wide characters, 
you'll need to store a list of negated character classes to re_set_long, 
just as you currently store a list of chars, ranges and equivalences.

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