使用C ++ std :: regex_replace匹配不同数量的行

Question

我可以使用C++ std::regex

提取包含此片段的四行字符串

  std::regex table("(<table id.*\n.*\n.*\n.*>)");
  const std::string format="$&";
  std::cout <<
     std::regex_replace(tidy_string(/* */)
        ,table
        ,format
        ,std::regex_constants::format_no_copy
        |std::regex_constants::format_first_only
        )
     << '\n';

tidy_string()返回std::string，代码会生成此输出：

<table id="creditPolicyTable" class=
                              "table table-striped table-condensed datatable top-bold-border bottom-border"
                              summary=
                              "This table of Credit Policy gives credit information (column headings) for list of exams (row headings).">

如何匹配具有不同行数而不是四行的文本？例如：

<table id="creditPolicyTable" summary=
                              "This table of Credit Policy gives credit information (column headings) for list of exams (row headings).">

或：

<table id="creditPolicyTable"
    class="table table-striped table-condensed datatable top-bold-border bottom-border"
   summary="This table of Credit Policy gives credit information (column headings) for list of exams (row headings)."
 more="x"
 even_more="y">

Answer 1

您应该使用std :: regex_search并懒惰地搜索除“＆gt;”之外的任何内容字符。像这样：

#include <iostream>
#include <regex>

int main() {
  std::string lines[] = {"<table id=\"creditPolicyTable\" class=\"\
table table-striped -table-condensed datatable top-bold-border bottom-border\"\
summary=\
\"This table of Credit Policy gives credit information (column headings) for list of exams (row headings).\">",
               "<table id=\"creditPolicyTable\" summary=\
               \"This table of Credit Policy gives credit information (column headings) for list of exams (row headings).\"\
               more=\"x\"\
               even_more=\"y\">"};
  std::string result;
  std::smatch table_match;

  std::regex table_regex("<table\\sid=[^>]+?>");

  for (const auto& line : lines){
    if (std::regex_search(line, table_match, table_regex)) {
      for (size_t i = 0; i < table_match.size(); ++i)
        std::cout << "Match found " << table_match[i] << '\n';
    }
  }
}