https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66359
Bug ID: 66359
Summary: Regex Fails to match
Product: gcc
Version: 4.9.2
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: ge...@schorsch-tech.de
Target Milestone: ---
// #define USE_STD
#ifdef USE_STD
#include <regex>
#else
#include <boost/regex.hpp>
#endif
#include <iostream>
#include <string>
#ifdef USE_STD
namespace rx = std;
#else
namespace rx = boost;
#endif
int main(int argc, char* argv[])
{
std::string line{ "Name:\tPiko_10_1 " };
rx::regex line_expression("^Name:\t {0,2}([a-zA-Z_0-9-]{1,20})
{0,20}$");
rx::match_results<std::string::const_iterator> line_what;
if (rx::regex_match(line, line_what, line_expression))
{
std::cout << "Found it" << std::endl;
}
else
{
std::cout << "ERROR: Did not find it" << std::endl;
return 1;
}
return 0;
}
Compile with:
std: g++ --std=c++11 main.cpp -o test-std.exe
Boost: g++ --std=c++11 main.cpp -o test-boost.exe -I PATH_TO_BOOST_INCLUDE _L
PATH_TO_BOOST_REGEX_LIB
I tried to convert an application from boost:.regex to std::regex. This example
is the boiled down example from my application.
With the define USE_STD defined, i get the error that this regex doesnt match.
With boost::regex i get a match. I tried this regex on TDM-GCC-4.9.2 and on
Linux gcc-4.9.2 (gentoo).
I know regex is not implemented Prior 4.9.0. I am on 4.9.2 so i guess it should
work. Other regexes like
std::regex line_expression("([a-zA-Z_]+) ?= ?([a-zA-Z0-9./]+)");
work as expected.
