[英]using string iterators over char* in boost regex
I am trying to search a char* to find matches and store each match as a struct using boost regex. 我正在尝试搜索char *以查找匹配并使用boost regex将每个匹配存储为结构。 I do not know how to use the std::string iterators over char*. 我不知道如何在char *上使用std :: string迭代器。 So I created std::string from char* and using them. 所以我从char *创建了std :: string并使用它们。 But now I want pointers in the original char* which can only be found using std::string I created. 但现在我想要原始char *中的指针,只能使用我创建的std :: string找到它。 See the following code. 请参阅以下代码。 The comments should clear your doubts. 评论应该清除你的疑虑。
typedef struct {
void *pFind; // Pointer to begining of match
int lenFind; // Length of match
} IppRegExpFind;
bool regExSearch(int nStrLen /*Length of input string*/,
std::vector<IppRegExpFind>& vectResult /*vector of struct to store matches*/,
int &numMatches /* number of matches*/,
const char *sStrInput /*Input string to be searched*/,
const char *sStrRegex /*Input regex string*/)
{
bool bStatusOk = true;
try{
std::string regexStr(sStrRegex);
std::string inputStr(sStrInput);
static const boost::regex ex(regexStr);
std::string::const_iterator start, end;
start = inputStr.begin();
end = inputStr.end();
boost::match_results<std::string::const_iterator> what;
boost::match_flag_type flags = boost::match_default;
std::vector <std::string> matches;
while(boost::regex_search(start, end, what, ex, flags))
{
matches.push_back(what.str());
start = what[0].second;
}
// convert boost:match_Results to a vector of IppRegExpFind
}
catch(...){
bStatusOk = false;
}
return bStatusOk;
}
You can get the original pointer by 您可以通过获取原始指针
sStrInput+what.position(0)
I'm not sure, however, why do you need all the tricks with std::string. 但是,我不确定为什么你需要使用std :: string的所有技巧。 According to the documentation, boost::regex_search
can search any range specified by bidirectional iterators (ie. char*
is a bidirectional iterator, so you pass ( str
, str+strlen(str)
) as start and end), and there are even overloads for char* that treat it as C string. 根据文档, boost::regex_search
可以搜索双向迭代器指定的任何范围(即char*
是双向迭代器,所以你传递( str
, str+strlen(str)
)作为开始和结束),甚至有char *的重载,将其视为C字符串。
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