[Bug libstdc++/67212] New: Infinite recurtion in std::regex_match

["antialize at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67212

            Bug ID: 67212
           Summary: Infinite recurtion in std::regex_match
           Product: gcc
           Version: 5.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: antialize at gmail dot com
  Target Milestone: ---

Created attachment 36184
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=36184&action=edit
Crashing program

The following code, crashes for some instances of line (as given in the
attachment):

std::regex lineExp("tpie::update_fractions\\([ ]*\"([^\"]+)\"[ ]*,[ ]*([^, ]+)[
]*,[ ]*([^\\) ]+)[ ]*\\);.*", std::regex::extended);
std::string line = <some_long_string_here>
std::smatch matches;
std::regex_match(line, matches, lineExp);


The crash ocure as we are running out of stack space in some possible infinite
recurtion. The context of the code can be seen here
https://github.com/thomasmoelhave/tpie/blob/cpp11-cleanup/tpie/fractional_progress.cpp#L64

The issue is triggered by:
g++ -std=c++11 test2.cc && ./a.out