[英]How can I find the index in a string that matches a boost regex?
如何在字符串中找到与boost正则表达式匹配的索引?
Use the position
member function of the match_results
: 使用
match_results
的position
成员函数:
int find_match_offset(std::string const& string_to_search,
boost::regex const& expression)
{
boost::smatch results;
if(boost::regex_match(string_to_search,results,expression))
{
return results.position()
}
return -1;
}
If you use boost::regex_match it's the whole string that's matching. 如果你使用boost :: regex_match,它就是匹配的整个字符串。
Maybe you mean to use regex_search: 也许你的意思是使用regex_search:
void index(boost::regex& re,const std::string& input){
boost::match_results<std::string::const_iterator> what;
boost::match_flag_type flags = boost::match_default;
std::string::const_iterator s = input.begin();
std::string::const_iterator e = input.end();
while (boost::regex_search(s,e,what,re,flags)){
std::cout << what.position() << std::endl;
std::string::difference_type l = what.length();
std::string::difference_type p = what.position();
s += p + l;
}
}
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