http://llvm.org/bugs/show_bug.cgi?id=16240
Bug ID: 16240
Summary: regex: regex_replace does not handle \b correctly
Product: libc++
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: All Bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Example from cplusplus.org reference:
std::string s ("there is a subsequence in the string\n");
std::regex e ("\\b(sub)([^ ]*)"); // matches words beginning by "sub"
// using string/c-string (3) version:
std::cout << std::regex_replace (s,e,"sub-$2");
Testing this with valgrind results in the message: "Invalid read of size 1"
This is because of setting match_prev_avail-flag in a case when we are at the
beginning of a string. This leads to a read operation one byte before the
beginning of the string in "__word_boundary<_CharT, _Traits>::__exec(__state&
__s) const"
The flag is set in "regex_iterator<BidirectionalIterator, _CharT,
_Traits>::operator++()" called from "regex_replace(_OutputIterator __out,
_BiderctionalIterator __first, _BiderctionalIterator __last,
const basic_regex<_CharT, _Traits>& __e, const _CharT* __fmt,
regex_constants::match_flag_type __flags = regex::constants::match_default)"
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