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<regex>: Fix word bounds \b and \B when applied to the empty string #5375

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Merged
merged 3 commits into from
Apr 10, 2025
+9 −2
Merged

<regex>: Fix word bounds \b and \B when applied to the empty string #5375

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dc1a84e
`<regex>`: Fix word bounds `\b` and `\B` when applied to the empty st…
muellerj2 Mar 28, 2025
ca63320
Use raw string literals.
StephanTLavavej Apr 1, 2025
4a0adf5
Merge branch 'main' into regex-fix-word-bounds-on-empty-string
StephanTLavavej Apr 10, 2025
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2 changes: 1 addition & 1 deletion stl/inc/regex
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Original file line number Diff line number Diff line change
Expand Up @@ -3497,7 +3497,7 @@ bool _Matcher<_BidIt, _Elem, _RxTraits, _It>::_Is_wbound() const {
}
} else { // --_Cur is not valid
if (_Tgt_state._Cur == _End) {
return (_Mflags & (regex_constants::match_not_bow | regex_constants::match_not_eow)) == 0;
return false;
} else {
return (_Mflags & regex_constants::match_not_bow) == 0 && _Is_word(*_Tgt_state._Cur);
}
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9 changes: 8 additions & 1 deletion tests/std/tests/VSO_0000000_regex_use/test.cpp
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Expand Up @@ -499,7 +499,7 @@ void test_VSO_225160_match_eol_flag() {

void test_VSO_226914_word_boundaries() {
const test_regex emptyAnchor(&g_regexTester, R"(\b)");
emptyAnchor.should_search_match("", "");
emptyAnchor.should_search_fail("");
emptyAnchor.should_search_fail("", match_not_bow);
emptyAnchor.should_search_fail("", match_not_eow);
emptyAnchor.should_search_fail("", match_not_bow | match_not_eow);
Expand Down Expand Up @@ -1171,6 +1171,12 @@ void test_gh_5253() {
g_regexTester.should_not_match("a", "()*");
}

void test_gh_5371() {
// GH-5371 <regex>: \b and \B are backwards on empty strings
g_regexTester.should_not_match("", "\\b");
g_regexTester.should_match("", "\\B");
}

int main() {
test_dev10_449367_case_insensitivity_should_work();
test_dev11_462743_regex_collate_should_not_disable_regex_icase();
Expand Down Expand Up @@ -1208,6 +1214,7 @@ int main() {
test_gh_5192();
test_gh_5214();
test_gh_5253();
test_gh_5371();

return g_regexTester.result();
}