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

11 Aug 2008

      Ok, it works for me now. Thanks a lot!

在2008-08-11 11:53:40，"Andrea Denzler"  写道：

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

Da:boost-users-bounces@lists.boost.org [mailto:boost-users-bounces@lists.boost.org] Per conto di gj_uestc
Inviato: lunedì 11 agosto 2008 5.35
A:boost-users@lists.boost.org; john@johnmaddock.co.uk
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 "	" (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 "	"(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®ards

Juan

在2008-08-08 16:48:38，"John Maddock"  写道：
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gj_uestc wrote:
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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/...

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],
John Maddock wrote:
likewise the other continuous blocks can be expressed in the same way.

HTH, John. 

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