https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77356
Bug ID: 77356
Summary: regex error for a ECMAScript syntax string
Product: gcc
Version: 7.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: wmi at google dot com
Target Milestone: ---
For the testcase 1.cxx:
----------------------------------------
#include <regex>
int main() {
static const char* kNumericAnchor ="(\\$|usd)(usd|\\$|to|and|up
to|[0-9,\\.\\-\\sk])+";
const std::regex re(kNumericAnchor);
return 0;
}
----------------------------------------
~/workarea/gcc-r239713/build/install/bin/g++ -std=c++11 -O0 1.cxx
-Wl,-rpath=/usr/local/google/home/wmi/workarea/gcc-r239713/build/install/lib64
./a.out
terminate called after throwing an instance of 'std::regex_error'
what(): Unexpected end of bracket expression.
Aborted (core dumped)
I have no problem to compile and run the testcase using libc++.
For libstdc++, the exception is thrown because the second dash '-' is not in
any range and it is not the start or end of bracket expression. According to
the comment in _M_expression_term in
src/libstdc++-v3/include/bits/regex_compiler.tcc this is not allowed in POSIX
syntax but allowed in ECMAScript syntax. Since the input is ECMAScript syntax,
libstdc++ shoudn't throw exception for it?
