Boost C++ regex - 如何获得多个匹配项

2021-12-24 00:00:00 regex c++ boost

如果我有一个简单的正则表达式模式，比如ab".我有一个字符串，它有多个匹配项，例如abc abd".如果我执行以下操作...

If I have a simple regex pattern like "ab." and I have a string that has multiple matches like "abc abd". If I do the following...

boost::match_flag_type flags = boost::match_default;
boost::cmatch mcMatch;
boost::regex_search("abc abd", mcMatch, "ab.", flags)

然后 mcMatch 只包含第一个abc"结果.如何获得所有可能的匹配项?

Then mcMatch contains just the first "abc" result. How can I get all possible matches?

推荐答案

你可以使用 boost::sregex_token_iterator 就像这个简短的例子:

You can use the boost::sregex_token_iterator like in this short example:

#include <boost/regex.hpp>
#include <iostream>
#include <string>

int main() {
    std::string text("abc abd");
    boost::regex regex("ab.");

    boost::sregex_token_iterator iter(text.begin(), text.end(), regex, 0);
    boost::sregex_token_iterator end;

    for( ; iter != end; ++iter ) {
        std::cout<<*iter<<'
';
    }

    return 0;
}

这个程序的输出是:

abc
abd

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