C++11正则表达式例子集合

#include <string>
#include <regex>
#include <iostream>
using namespace std;int testRegexSearch()
{//定义正则表达式,匹配时间格式regex testRegex("[0-9]{2}:[0-9]{2}:[0-9]{2}\\.[0-9]{3}");//要匹配的字符串string strText("OTA LOG SFTCH/MPA Stream 2/Reservation Accept  07:23:50.580 Channel: 147, Pilot PN: 232");//结果:cmatch只能存储一个结果cmatch result; //search 是匹配子字符串, match 是匹配整个字符串if (regex_search(strText.c_str(), result, testRegex, regex_constants::format_default)){cout << result.str() << endl;}else{cout << "fail." << endl;}return 0;
}bool test_email_valid(const std::string& email)
{const std::regex pattern("(\\w+)(\\.|_)?(\\w*)@(\\w+)(\\.(\\w+))+");bool isValid = std::regex_match(email, pattern);std::cout << email << " : " << (isValid ? "valid" : "invalid") << std::endl;return isValid;
}int testRegexMatch()
{std::string email1 = "marius.bancila@domain.com";    std::string email2 = "mariusbancila@domain.com";    std::string email3 = "marius_b@domain.co.uk";    std::string email4 = "marius@domain";       test_email_valid(email1);test_email_valid(email2);test_email_valid(email3);test_email_valid(email4);    return 0;
}void show_ip_parts(const std::string& ip)
{// IP格式const std::regex pattern("(\\d{1,3}):(\\d{1,3}):(\\d{1,3}):(\\d{1,3})");    // object that will contain the sequence of sub-matches    std:: match_results<std::string::const_iterator> result;// match the IP address with the regular expression    bool valid = std:: regex_match(ip, result, pattern);    std::cout << ip << " \t: " << (valid ? "valid" : "invalid") << std::endl;// if the IP address matched the regex, then print the parts    if(valid)        {        std::cout << "b1: " << result[1] << std::endl;        std::cout << "b2: " << result[2] << std::endl;        std::cout << "b3: " << result[3] << std::endl;        std::cout << "b4: " << result[4] << std::endl;        }
}int testMatchResult()
{    show_ip_parts("1:22:33:444");    show_ip_parts("1:22:33:4444");    show_ip_parts("100:200");           return 0;
}int testMultiSearch()
{    // 星期模式const std::regex pattern("\\w+day");       // 文本 std::string weekend = "Saturday and Sunday, but some Fridays also.";//需要注意一下这里const std::sregex_token_iterator end;for (std::sregex_token_iterator it(weekend.begin(),weekend.end(), pattern); it != end ; ++it){std::cout << *it << std::endl;}std::cout<<std::endl;return 0;
}int regexReplace()
{    // 需要转换的文本std::string text = "This is a element and this a unique ID.";    // regular expression with two capture groupsconst std::regex pattern("(\\ba (a|e|i|u|o))+");// the pattern for the transformation, using the second// capture groupstd::string replace = "an $2";std::string newtext = std::regex_replace(text, pattern, replace);std::cout << newtext << std::endl;std::cout << std::endl;return 0;
}std::string format_date(const std::string& date)
{    // regular expression    const std:: regex pattern("(\\d{1,2})(\\.|-|/)(\\d{1,2})(\\.|-|/)(\\d{4})");// transformation pattern, reverses the position of all capture groupsstd::string replacer = "$5$4$3$2$1";// apply the tranformationreturn std:: regex_replace(date, pattern, replacer);
}int regexReplaceDate()
{    std::string date1 = "1/2/2008";    std::string date2 = "12.08.2008";   std::cout << date1 << " -> " << format_date(date1) << std::endl;    std::cout << date2 << " -> " << format_date(date2) << std::endl;    std::cout << std::endl;    return 0;
}int searchCount() {// "new" and "delete" 出现的次数是否一样？    std::regex reg("(new)|(delete)");    std::smatch m;    std::string s = "Calls to new must be followed by delete. Calling simply new results in a leak!";    int new_counter=0;    int delete_counter=0;    std::string::const_iterator it=s.begin();    std::string::const_iterator end=s.end();    while (std::regex_search(it, end, m, reg)){// 是 new 还是 delete?m[1].matched ? ++new_counter : ++delete_counter;it=m[0].second;}if (new_counter!=delete_counter) {std::cout << "Leak detected!\n";}else {std::cout << "Seems ok...\n";}std::cout << std::endl;return 0;
}int testRegexMain()
{// 1) 搜索时间格式 07:23:50.580 并显示出来cout << ">>>>>>>>>>>>>>testRegexSearch" << endl;testRegexSearch();// 2) 检测email格式是否正确 marius.bancila@domain.comcout << ">>>>>>>>>>>>>>testRegexMatch" << endl;testRegexMatch();// 3) 检测是否符合IP格式: 1:22:33:4444，如果符合输出IP的4个部分内容cout << ">>>>>>>>>>>>>>testMatchResult" << endl;testMatchResult();// 4) 查找显示所有符合星期格式的单词：Saturdaycout << ">>>>>>>>>>>>>>testMultiSearch" << endl;testMultiSearch();// 5) 替换符合格式的文本内容：元音开头前面的a改成ancout << ">>>>>>>>>>>>>>regexReplace" << endl;regexReplace();// 6) 年月日格式的转换，将DD-MM-YYYY –> YYYY-MM-DDcout << ">>>>>>>>>>>>>>regexReplaceDate" << endl;regexReplaceDate();// 7) "new" and "delete" 出现的次数是否一样？cout << ">>>>>>>>>>>>>>searchCount" << endl;searchCount();return 0;
}

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