如何使用C ++ Boost的regex_iterator() [英] How to use C++ Boost's regex_iterator()
问题描述
我使用升压匹配字符串中的子串。木卫一遍历结果,我需要使用<一个href=\"http://www.boost.org/doc/libs/1_42_0/libs/regex/doc/html/boost_regex/ref/regex_iterator.html\"><$c$c>regex_iterator()$c$c>.
这是唯一的用法示例我已经找到,但我不明白的回调。可能有人给我函数的例子uage?
让我们假设我输入文本是:
大家好,这是一段话
喇嘛喇嘛14 ..是的
日期1986年4月15日
我想获得:
你好,大家,这个是一sentense,喇嘛是约会
如果你不明白的例子中只有一部分是回调,考虑到:
的std :: for_each的(M1,M2和放大器; regex_callback);
大致相当于:
的(; M1 = 2;!++ M1){
class_index [(* M1)[5]名为.str()+(* M1)[6]名为.str()] =(* M1).POSITION(5);
}
假设,你的情况,你要所有匹配存储在一个向量,你会写是这样的:
//警告,未经测试:
提高:: sregex_iterator M1(text.begin(),text.end(),前pression);
提高:: sregex_iterator平方米;
的std ::矢量&lt;标准::字符串&GT;令牌;
对于(; M1 = 2;!++ M1){
tokens.push_back(M1-GT&; STR())。
}
I am using Boost to match substrings in a string. Io iterate over the results, I need to use regex_iterator()
.
That is the only usage example I have found, but I do not understand the callback. Could someone give me an example uage of the function?
Let us assume that my input text is:
"Hello everybody this is a sentense
Bla bla 14 .. yes
date 04/15/1986
"
I want to get:
"Hello" "everybody" "this" "is" "a" "sentense" "bla" "yes" "date"
If the only part of the example you don't understand is the callback, consider that:
std::for_each(m1, m2, ®ex_callback);
is roughly equivalent to:
for (; m1 != m2; ++m1){
class_index[(*m1)[5].str() + (*m1)[6].str()] = (*m1).position(5);
}
Assuming that, in your case, you want to store all the matches in a vector, you would write something like:
//Warning, untested:
boost::sregex_iterator m1(text.begin(), text.end(), expression);
boost::sregex_iterator m2;
std::vector<std::string> tokens;
for (; m1 != m2; ++m1){
tokens.push_back(m1->str()).
}
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