环境：Ubuntu 15.10、QtCreator CMake c++
头文件 #include <regex>
regex_search:
std::regex pattern;
pattern = "(HTTP/1\\.1|HTTP/1\\.0) \\d{3} [ \\-a-zA-Z]+\r\n(.+: .+\r\n)+\r\n";
test = "HTTP/1.1 200 OK\r\n"
"Date: Thu, 24 Dec 2015 15:25:43 GMT\r\n"
"Server: Apache/2.2.15 (CentOS)\r\n"
"X-Powered-By: PHP/5.3.3\r\n"
"Set-Cookie: PHPSESSID=ioa4vje3mm8t3utigst4rjgdk4; path=/\r\n"
"Expires: Thu, 19 Nov 1981 08:52:00 GMT\r\n"
"Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0\r\n"
"Pragma: no-cache\r\n"
"Content-Length: 22\r\n"
"Connection: close\r\n"
"Content-Type: text/html; charset=utf-8\r\n"
"\r\n"
"cannot connect server\r\n";
if(regex_search(test, pattern))
cout << "successful" << endl;
else
cout << "failed" << endl;
regex_match:
std::regex pattern;
pattern = "^((\\d|[1-9]\\d|1\\d\\d|2[0-4]\\d|25[0-5])\\.){3}(\\d|[1-9]\\d|1\\d\\d|2[0-4]\\d|25[0-5])$";
test = "123.123.123.123";
if(regex_search(test, pattern))
cout << "successful" << endl;
else
cout << "failed" << endl;
在使用过程中遇到的问题为换行符(\r\n)的匹配，找了一圈并没有找到有单行模式的选项，最后只能用regex_search来代替 regex_match的使用。
史上最复杂的验证邮件地址的正则表达式：http://www.linuxdiyf.com/linux/13186.html
Linux正则表达式grep与egrep：http://www.linuxdiyf.com/linux/11224.html
Linux基础：正则表达式：http://www.linuxdiyf.com/linux/5555.html