Ignore case using boost::regex_search

问题

How do you use boost::regex_search with the ignore case flags or constants in C++?

Please post an easy example.

Thanks!

回答1:

You need something like this

boost::regex regex("your expression here", boost::regex::icase);
boost::smatch what;

string mystring;
bool search_result = boost::regex_search(mystring.begin(),mystring.end(), what, regex);

回答2:

Or something like this (without setting boost::regex::icase):

boost::regex regex("(?i)expression");
boost::smatch what;

string mystring;
bool search_result = boost::regex_search(mystring.begin(),mystring.end(), what, regex);

来源：https://stackoverflow.com/questions/6248291/ignore-case-using-boostregex-search