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c++stringstderase

Remove characters from std::string from "(" to ")" with erase ?

I want to remove the substring of my string , it looks something like this : 

At(Robot,Room3)

or 

SwitchOn(Room2)

or 

SwitchOff(Room1)

How can I remove all the characters from the left bracket ( to the right bracket ) , when I don't know their indexes ?

Solution

  • If you know the string matches the pattern then you can do:

    std::string str = "At(Robot,Room3)";
str.erase( str.begin() + str.find_first_of("("),
           str.begin() + str.find_last_of(")"));

    or if you want to be safer

    auto begin = str.find_first_of("(");
auto end = str.find_last_of(")");
if (std::string::npos!=begin && std::string::npos!=end && begin <= end)
    str.erase(begin, end-begin);
else
    report error...

    You can also use the standard library <regex>.

    std::string str = "At(Robot,Room3)";
str = std::regex_replace(str, std::regex("([^(]*)\\([^)]*\\)(.*)"), "$1$2");