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* [Bug libstdc++/63920] New: Any regular expression should not match an empty sequence if match_not_null is specified @ 2014-11-17 17:49 kariya_mitsuru at hotmail dot com 2014-11-18 18:57 ` [Bug libstdc++/63920] " kariya_mitsuru at hotmail dot com ` (3 more replies) 0 siblings, 4 replies; 5+ messages in thread From: kariya_mitsuru at hotmail dot com @ 2014-11-17 17:49 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63920 Bug ID: 63920 Summary: Any regular expression should not match an empty sequence if match_not_null is specified Product: gcc Version: 5.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: libstdc++ Assignee: unassigned at gcc dot gnu.org Reporter: kariya_mitsuru at hotmail dot com Created attachment 34005 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=34005&action=edit gcc -v The sample code below should output "not match" but it outputs "match:1, 0" if it is compiled by gcc 5.0. ==================================================================================================== #include <iostream> #include <regex> int main() { std::cmatch m; auto result = std::regex_search("a", m, std::regex("b*"), std::regex_constants::match_not_null); if (result) { std::cout << "match:" << m.position() << ", " << m.length() << std::endl; } else { std::cout << "not match" << std::endl; } } ==================================================================================================== cf. http://melpon.org/wandbox/permlink/pTz5CBMMP4a6BU7f According to C++11 standard 28.5.2[re.matchflag]/Table 139, "The expression shall not match an empty sequence." if match_not_null is specified. Note that the sample code of the Boost.regex version outputs "not match". cf. http://melpon.org/wandbox/permlink/mfFqERCbt6qFf8HC ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug libstdc++/63920] Any regular expression should not match an empty sequence if match_not_null is specified 2014-11-17 17:49 [Bug libstdc++/63920] New: Any regular expression should not match an empty sequence if match_not_null is specified kariya_mitsuru at hotmail dot com @ 2014-11-18 18:57 ` kariya_mitsuru at hotmail dot com 2014-11-25 5:43 ` timshen at gcc dot gnu.org ` (2 subsequent siblings) 3 siblings, 0 replies; 5+ messages in thread From: kariya_mitsuru at hotmail dot com @ 2014-11-18 18:57 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63920 --- Comment #1 from Mitsuru Kariya <kariya_mitsuru at hotmail dot com> --- Sorry, the last link was mistaken. The right link is below. http://melpon.org/wandbox/permlink/v1HhsIs8d2LrmUk9 ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug libstdc++/63920] Any regular expression should not match an empty sequence if match_not_null is specified 2014-11-17 17:49 [Bug libstdc++/63920] New: Any regular expression should not match an empty sequence if match_not_null is specified kariya_mitsuru at hotmail dot com 2014-11-18 18:57 ` [Bug libstdc++/63920] " kariya_mitsuru at hotmail dot com @ 2014-11-25 5:43 ` timshen at gcc dot gnu.org 2015-02-06 7:04 ` timshen at gcc dot gnu.org 2023-07-20 11:35 ` redi at gcc dot gnu.org 3 siblings, 0 replies; 5+ messages in thread From: timshen at gcc dot gnu.org @ 2014-11-25 5:43 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63920 --- Comment #2 from Tim Shen <timshen at gcc dot gnu.org> --- Author: timshen Date: Tue Nov 25 05:43:04 2014 New Revision: 218037 URL: https://gcc.gnu.org/viewcvs?rev=218037&root=gcc&view=rev Log: PR libstdc++/63920 * include/bits/regex_executor.h: Make _M_begin non const. * include/bits/regex_executor.tcc (_Executor<>::_M_search): Increase _M_begin in search algorithm, so that _M_begin is treated as "current start position" for each search iteration. * testsuite/28_regex/algorithms/regex_search/ecma/flags.cc: New testcase. Modified: trunk/libstdc++-v3/ChangeLog trunk/libstdc++-v3/include/bits/regex_executor.h trunk/libstdc++-v3/include/bits/regex_executor.tcc trunk/libstdc++-v3/testsuite/28_regex/algorithms/regex_search/ecma/flags.cc ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug libstdc++/63920] Any regular expression should not match an empty sequence if match_not_null is specified 2014-11-17 17:49 [Bug libstdc++/63920] New: Any regular expression should not match an empty sequence if match_not_null is specified kariya_mitsuru at hotmail dot com 2014-11-18 18:57 ` [Bug libstdc++/63920] " kariya_mitsuru at hotmail dot com 2014-11-25 5:43 ` timshen at gcc dot gnu.org @ 2015-02-06 7:04 ` timshen at gcc dot gnu.org 2023-07-20 11:35 ` redi at gcc dot gnu.org 3 siblings, 0 replies; 5+ messages in thread From: timshen at gcc dot gnu.org @ 2015-02-06 7:04 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63920 Tim Shen <timshen at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |RESOLVED Resolution|--- |FIXED --- Comment #3 from Tim Shen <timshen at gcc dot gnu.org> --- Fixed. ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug libstdc++/63920] Any regular expression should not match an empty sequence if match_not_null is specified 2014-11-17 17:49 [Bug libstdc++/63920] New: Any regular expression should not match an empty sequence if match_not_null is specified kariya_mitsuru at hotmail dot com ` (2 preceding siblings ...) 2015-02-06 7:04 ` timshen at gcc dot gnu.org @ 2023-07-20 11:35 ` redi at gcc dot gnu.org 3 siblings, 0 replies; 5+ messages in thread From: redi at gcc dot gnu.org @ 2023-07-20 11:35 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63920 Jonathan Wakely <redi at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Target Milestone|--- |5.0 ^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2023-07-20 11:35 UTC | newest] Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2014-11-17 17:49 [Bug libstdc++/63920] New: Any regular expression should not match an empty sequence if match_not_null is specified kariya_mitsuru at hotmail dot com 2014-11-18 18:57 ` [Bug libstdc++/63920] " kariya_mitsuru at hotmail dot com 2014-11-25 5:43 ` timshen at gcc dot gnu.org 2015-02-06 7:04 ` timshen at gcc dot gnu.org 2023-07-20 11:35 ` redi at gcc dot gnu.org
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