boost::split(result, input, boost::is_any_of(“(, )”)) can't split empty space

Question

code is:

vector<string> result;
string input = "Ellipse(50, 50, 200, 300)"
boost::split(result, input, boost::is_any_of("(, )"))

int i=0;
for (auto at=result.begin(); at != result.end(); at++)
    cout << ++i << " " << *at << endl;

output is:

1 Ellipse
2 50
3 
4 50
5 
6 200
7
8 300
9

I want to get just Ellipse and integers, not empty space.

How can I get correct result?

input string can't be changed.

Answer 1

This will remove the empty spaces properly: erase_all(str1, " "); .

Another alternative would be to use boost::token_compress_on :

boost::trim_if(input, boost::is_any_of(" "));
boost::split(result, input, boost::is_any_of("(, )"), boost::token_compress_on);

This question was already asked: boost::split leaves empty tokens at the beginning and end of string - is this desired behaviour? and How to use boost split to split a string and ignore empty values?