[Boost-users] R: [boost.regex]Does boost:u32regexrecognize theunicode named blocks like "\p{IsBasicLatin}"?

From: Andrea Denzler (andrea_at_[hidden])
Date: 2008-08-10 23:53:40

Juan, I have no problems with this sample code

 

#include "stdafx.h"

 

void test(wstring str)

{

            u32regex expression = make_u32regex("^([\\x0-\\x7f]+)$"); 

            wsmatch what; 

            if(u32regex_match(str, what, expression)) 

            { 

                        // what[0] contains the whole string 

                        // what[1] contains ascii text

                        wcout << what[1] << _T(" is ascii") << endl;

            } else {

                        wcout << str << _T(" is not ascii") << endl;

            }

}

 

int _tmain(int argc, _TCHAR* argv[])

{

            test(_T("Hello World!"));

            test(_T("ôöò"));

            return 0;

}

 

 

Hello World! is ascii

¶÷‗ is not ascii

 

 

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Da: boost-users-bounces_at_[hidden] [mailto:boost-users-bounces_at_[hidden]] Per conto di gj_uestc
Inviato: lunedì 11 agosto 2008 5.35
A: boost-users_at_[hidden]; john_at_[hidden]
Oggetto: Re: [Boost-users] [boost.regex]Does boost:u32regexrecognize theunicode named blocks like "\p{IsBasicLatin}"?

 

 Thanks John,

     I have used "[\x0-\x7f]" instead of "/p{IsBasicLatin}" to construct the regular expression (expression=boost::make_u32regex("[\\x0-\\x7f]" )). The regular expression has been  constructed correctly but it cannot accecpt instance string either "a" or "&#x9;" (boost:u32match("a",expression)==false).I am wondering whether it has something to do with unicode? I have tried expression=boost::regex("[\\x0-\\x7f]" )); then I can pass the string "a" but not string "&#x9;"(boost:match("a",expression)==true), which I think is reaonable for boost:regex since it does not support the unicode. So my point is: why the boost:u32match doesn't work well?

 

Thanks&regards

Juan

 

 

 

 

在2008-08-08 16:48:38，"John Maddock" <john_at_[hidden]> 写道：
>John Maddock wrote:
>>> gj_uestc wrote:
>>>>> Hi,all
>>>>>    Nowadays I am using boost:u32regex to do some regular expression
>>>>> processing.But it seems that "/p{IsBasicLatin}"is not a accessable
>>>>> expression by boost::make_u32regex(tmp).Does boost:regex not suppor
>>>>> the named unicode blocks or I have to pass some other flags to the
>>>>> library? Now I was using the defult flag wich indicate using perl
>>>>> syntactic.
>>> 
>>> The named properties/character classes supported are here:
>>> http://www.boost.org/doc/libs/1_35_0/libs/regex/doc/html/boost_regex/syntax/character_classes/optional_char_class_names.html
>>> 
>>> As you can see I haven't added support for language-specific blocks
>>> yet :-(
> 
>I forgot to mention that \p{IsBasicLatin} is the same as: [\x0-\x7f], 
>likewise the other continuous blocks can be expressed in the same way.
> 
>HTH, John. 
> 

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