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str.md

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str

  • regex[meta header]
  • std[meta namespace]
  • match_results[meta class]
  • function[meta id-type]
  • cpp11[meta cpp]
string_type str(size_type sub = 0) const;

概要

指定されたサブマッチが指す文字列を返す。

要件

ready() == true

戻り値

string_type((*this)[sub])

例

#include <iostream>
#include <regex>

int main()
{
  const char s[] = " abc 0123 defgh ";
  const std::regex re("(\\w+) (\\d+) (\\w+)");

  std::cmatch m;
  if (std::regex_search(s, m, re)) {
    std::cout << "str() = '" << m.str() << "', length() = " << m.length() << std::endl;
    for (std::size_t i = 0, n = m.size(); i < n; ++i) {
      std::cout << "str(" << i << ") = '" << m.str(i) << "', length(" << i << ") = " << m.length(i) << std::endl;
    }
  } else {
    std::cout << "not match" << std::endl;
  }
}
  • m.str[color ff0000]
  • std::regex[link ../basic_regex.md]
  • std::cmatch[link ../match_results.md]
  • std::regex_search[link ../regex_search.md]
  • m.size[link size.md]
  • m.length[link length.md]

出力

str() = 'abc 0123 defgh', length() = 14
str(0) = 'abc 0123 defgh', length(0) = 14
str(1) = 'abc', length(1) = 3
str(2) = '0123', length(2) = 4
str(3) = 'defgh', length(3) = 5

バージョン

言語

  • C++11

処理系

  • Clang: 3.0 [mark verified], 3.1 [mark verified], 3.2 [mark verified], 3.3 [mark verified], 3.4 [mark verified], 3.5 [mark verified], 3.6 [mark verified]
  • GCC: 4.9.0 [mark verified], 4.9.1 [mark verified], 5.0.0 [mark verified]
  • ICC: ??
  • Visual C++: ??