How can I get the name of the group corresponding to the pattern match using Boost regular expressions?
The following will output the matched expression to the given pattern. But how can I get the corresponding named group?
boost::regex pattern("(?<alpha>[0-9]*\\.?[0-9]+)|(?<beta>[a-zA-Z_]+)");
string s = "67.2 x 7 I am";
string::const_iterator start = s.begin();
string::const_iterator end = s.end();
boost::sregex_token_iterator i(start, end, pattern);
boost::sregex_token_iterator j;
for ( ;i != j; ++i)
{
cout << *i << endl;
// '67.2' and '7' belongs to "alpha"
// 'x', 'I', 'am' belongs to "beta"
}
你可以从match_result
获得它它适用于xpressive ,但同样适用于Boost.Regex
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.