2013-08-22  Tim Shen  <timshen91@gmail.com>

	* include/bits/regex.h: Executor caller.
	* include/bits/regex_executor.h: Fix empty grouping problem.
	* include/bits/regex_executor.tcc: Same.
	* testsuite/28_regex/algorithms/regex_match/ecma/cstring_emptygroup.cc:
	  New.

From-SVN: r201914