使用C ++ STl TR1正则表达式在2个定界符之间获取字符串

Question

I want to extract string between open and close bracket.So if the content is

145(5)(7)

the output must be

5

7

I tried with C++ STL TR1 using below code

const std::tr1::regex pattern("\\((.*?)\\)");

// the source text
std::string text= "145(5)(7)";

 const std::tr1::sregex_token_iterator end;
 for (std::tr1::sregex_token_iterator i(text.begin(),
      text.end(), pattern);
      i != end;
      ++i)
 {
      std::cout << *i << std::endl;
 }

I am getting the output as,

(5)

(7)

I want the output without delimiters.

Please help me to meet my requirement using STL TR1.

Answer 1

You need to use sregex_iterator instead of sregex_token_iterator and then access the submatches via .str(n) :

const std::tr1::regex pattern1("\\((.*?)\\)");
std::string text= "145(5)(7)";
const std::tr1::sregex_iterator end;
for (std::tr1::sregex_iterator i(text.begin(),
    text.end(), pattern1);
    i != end;
    ++i)
{
    std::cout << (*i).str(1) << std::endl;
}