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std::match_results<BidirIt,Alloc>::position

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< cpp‎ | regex‎ | match results
 
 
 
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difference_type position( size_type n = 0 ) const;
(since C++11)

Returns the position of the first character of the specified sub-match.

If n == 0, the position of the first character of the entire matched expression is returned.

If n > 0 && n < size(), the position of the first character of the nth sub-match is returned.

if n >= size(), a position of the first character of the unmatched match is returned.

ready() must be true. Otherwise, the behavior is undefined.

[edit] Parameters

n - integral number specifying which match to examine

[edit] Return value

The position of the first character of the specified match or sub-match.

[edit] Example

Run this code
#include <iostream>
#include <regex>
#include <string>
 
int main()
{
 std::regex re("a(a)*b");
 std::string target("aaab");
 std::smatch sm;
 
 std::regex_match (target, sm, re);
 std::cout << sm.position(1) << '\n';
}

Output:

2

[edit] See also

returns specified sub-match
(public member function) [edit]
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