c++ - How to get string with pattern from std::regex in VC++ 2010 -

can string regular expression std::regex? or should save somewhere else if want use later?

in boost can this:

boost::regex reg("pattern"); string p = reg.str(); 

or use << operator

cout << reg; print pattern.

but in std::regex there no str() or operator<<. should save string somewhere else or can't find it?

in debugger can see what's in std::regex.

i looked in n3225, section 28.4 (header <regex> synopsis) , indeed, basic_regex template has no member function str, , there no operator<< provided.

the paragraph 28.8/2 provides a little insight on :

objects of type specialization of basic_regex responsible converting sequence of chart objects an internal representation. not specified form representation takes, nor how accessed algorithms operate on regular expressions.

what understand standard mandates basic_regex can constructed const chart * not require implementation keep string.