Separating string with two characters

Question

I want to separate string by character "," or ";".

std::string input = "abc,def;ghi";
std::istringstream ss(input);
std::string token;

while(std::getline(ss, token, ',')) { //how to add here ";"?
    std::cout << token << '\n';
}

you can write function that splits string to strings array by one character, and then use it as many times as needs with different characters. — Arkady, Aug 26 '14 at 11:14
First use either , or ;. Then get each token and again tokenize those tokens by other seperator. e.g. if you first tokenize by ; then get each token and tokenize them again by , — Thusitha Thilina Dayaratne, Aug 26 '14 at 11:15
You can use any tokenizers that already written. boost, poco. You can write your own using "find" function. I don't see problem. — Arkady, Aug 26 '14 at 11:16

score 3 · Answer 1 · answered Aug 26 '14 at 11:21

3

Use the Boost Tokenizer library:

boost::char_separator<char> sep(",;");
boost::tokenizer<boost::char_separator<char>> tokens(input, sep);

answered Aug 26 '14 at 11:21

Paul Evans

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Including boost for this little peace of code? – Quest Aug 26 '14 at 11:21
@PaulR i don't think that he will use anything else from boost, so including boost just for tokenizer... – Quest Aug 26 '14 at 11:24
3

I still don't see what the objection is - if you're serious about writing C++ code then boost should be part of your weaponry. And of course you only need to include the parts of boost that you need, and these are mostly header-only, i.e. no libraries. – Paul R Aug 26 '14 at 11:26
1

There's also `boost::split` and `boost::is_any_of`. – Rapptz Aug 26 '14 at 11:28
1

@Rapptz: +1: yes, see [this answer](http://stackoverflow.com/a/236976/253056) – Paul R Aug 26 '14 at 11:29

score 1 · Accepted Answer · answered Aug 26 '14 at 11:21

1

what about old way style?

std::string string = "abc,def;ghi";
std::vector<std::string>strings;
std::string temp;
for(int i=0; i < string.length(); i++)
{
    if(string[i] == ',' || string[i] == ';')
    {
        strings.push_back(temp);
        temp.clear();
    }
    else
    {
        temp += string[i];
    }
}
strings.push_back(temp);

live demo

answered Aug 26 '14 at 11:21

Quest

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This is a really meh way of doing it. Could be improved with `std::string::find`, `std::string::substr` etc. – Rapptz Aug 26 '14 at 11:23
@Rapptz Yeah i could, i will add it to the answer – Quest Aug 26 '14 at 11:25

score 0 · Answer 3 · answered Aug 26 '14 at 11:40

Using strsep in string.h from C library , you could do it like this:

std::string input = "abc,def;ghi";
const char* ss = intput.c_str();
const char token[] = ",;";

for (const char* part; (part = strsep(&ss, token)) != NULL;) {
    std::cout<< part << std::endl;
}

Separating string with two characters

3 Answers3