regex:正则匹配

字符串分割

getline(sstream,string,‘ch’);
相当于python的split方法

#include
#include
#include
#include
using namespace std;
int main() {
	vector<string> strs;
	stringstream ss("134,45,56");
	string s;
	string s2;
	while (getline(ss, s, ',')) {
		cout << s << endl;
		strs.push_back(s);
	}
	return 0;
}

懒惰分割[…]内部的字符串

	regex reg("\\[.*?\\]");
	smatch match_res;
	string s("[abc def],[kg],[nh]");//[abc def],[kg],[nh]
	string ss;
	string::const_iterator it = s.begin();
	string::const_iterator end = s.end();
	while (regex_search(it, end, match_res, reg))
	{
		string temp = match_res.str();
		it = match_res[0].second;//这一句是用来向后延展的，不然总是会返回第一个搜索到的值
		cout << temp << endl;
	}

使用括号提取所需要的部分

#include
#include
#include
#include
#include
using namespace std;
int main() {
	regex reg("\\[(.*?)#(.*?)\\]");
	smatch match_res;
	string s("[abc#def],[k#g],[n#h]");//[abc def],[kg],[nh]
	string ss;
	string::const_iterator it = s.begin();
	string::const_iterator end = s.end();
	while (regex_search(it, end, match_res, reg))
	{
		string temp = match_res.str();
		cout << match_res.size()<<endl;
		it = match_res[0].second;//这一句是用来向后延展的，不然总是会返回第一个搜索到的值
		cout << temp << endl;
		cout << match_res[1].str() << endl;
		cout << match_res[2].str() << endl;
	}

	return 0;