c++ - How to print value in boost::u32regex & reg -

i want print value in boost::u32regex & reg using std::cout.

for boost::regex & reg, can print reg.str() not able use str() boost::u32regex.

can please tell me ?

it seems type used behind boost::u32regex not compatible cout. seems using uchar32 icu library.

you can print regex value using iterators :

#include <boost/regex.hpp> #include <boost/regex/icu.hpp> #include <unicode/ustream.h>  void printregex32( const boost::u32regex& r ) {     boost::u32regex::iterator  = r.begin();     boost::u32regex::iterator ite = r.end();      ( ; != ite; ++it )     {         std::cout << unicodestring(*it) << std::endl;     } } 

this working me. not easy printing boost::regex value works. suggest create function so, in example.

edit :

you can try code :

boost::u32regex r = boost::make_u32regex("(?:\\a|.*\\\)([^\\\]+)"); printregex32( r ); 

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i can print reg.str()

just information, boost::basic_regex has operator<< overload doing same thing :

// reg boost::regex std::cout << reg.str() << std::endl; 

is same thing as

// reg boost::regex std::cout << reg << std::endl;