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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Wrong implementation for regex_constants in clang"
href="https://bugs.llvm.org/show_bug.cgi?id=42199">42199</a>
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<th>Summary</th>
<td>Wrong implementation for regex_constants in clang
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>Macintosh
</td>
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<th>OS</th>
<td>MacOS X
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>C++11
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
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<th>Reporter</th>
<td>youkaichao@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>blitzrakete@gmail.com, dgregor@apple.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<p>
<div>
<pre>The following code:
```
#include <regex>
#include <iostream>
using namespace std;
int main()
{
regex re0("^cd");
string str = "cd";
cout << regex_search(str, re0, regex_constants::match_prev_avail) <<
endl;
cout << regex_search(str, re0) << endl;
}
```
gives the output:
```
1
1
```
But as specified in the c++ standard, the output should be:
```
0
1
```</pre>
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