正则表达式编程实例

立羽

发布于 2023-08-24 13:07:26

1270

发布于 2023-08-24 13:07:26

1.使用c++的正则表达式替换对应内容

std::string sKey = it->first;
		std::string sPattern = "(<)(/)?(" + sKey + ")(>)";
		std::regex rPattern(sPattern);

		std::string sReplace = "$1$2" + it->second + "$4";
		sMsg = std::regex_replace(sMsg, rPattern, sReplace);

sKey为要查找的关键词。sPattern为关键词加上正则格式后的字符串， "(<)(/)?(" + sKey + ")(>)"，第一个()中表示有一个"<",第二个()后的?表示在<后是否存在?。整体意思为查"<heros1>", "</heros1>"这样的字符串。 sReplace为匹配串模式 "

2.找出所有的坐标点

std::smatch rPotRet;
			std::regex rPotPattern("[(]([0-9]+),([0-9]+)[)]");
			const std::sregex_token_iterator end;

			for (std::sregex_token_iterator itPot(sMsg.begin(), sMsg.end(), rPotPattern); itPot != end; ++itPot)
			{
				std::string sPot = *itPot;
				if (std::regex_search(sPot, rPotRet, rPotPattern))
				{
					CPoint pot;
					pot.x = atoi(rPotRet[1].str().c_str());
					pot.y = atoi(rPotRet[2].str().c_str());
					vecPot.push_back(pot);
				}
			}

"[(]([0-9]+),([0-9]+)[)]"： [(]为必有一个(；[0-9]+表示有若干个0-9的数。整个意思就是查找 "(20,89)" ，“(1,22)”这样的字符串。

源代码

// regex1.cpp : 定义控制台应用程序的入口点。
//

#include "stdafx.h"
#include <regex>
#include <iostream>
#include <string>
#include <vector>
#include <map>
#include "Windows.h" 
#include "Windef.h" 
#include "atltypes.h"

typedef std::map<std::string, std::string> MapColorType;
MapColorType GmapColor;

void mapColorInit()
{
	GmapColor.insert(MapColorType::value_type("heros1", "12FFFGSEVF"));
	GmapColor.insert(MapColorType::value_type("heros2", "22FDGRG7"));
	GmapColor.insert(MapColorType::value_type("location", "24FDGRG7"));
}

std::string regexDeal(std::string sMsg, MapColorType mapColor, std::vector<CPoint>& vecPot)
{
	std::string sRet;
	for (MapColorType::iterator it = mapColor.begin(); it != mapColor.end(); it++)
	{
		std::string sKey = it->first;
		std::string sPattern = "(<)(/)?(" + sKey + ")(>)";
		std::regex rPattern(sPattern);

		std::string sReplace = "$1$2" + it->second + "$4";
		sMsg = std::regex_replace(sMsg, rPattern, sReplace);

		if (sKey == "location")
		{
			std::smatch rPotRet;
			std::regex rPotPattern("[(]([0-9]+),([0-9]+)[)]");
			const std::sregex_token_iterator end;

			for (std::sregex_token_iterator itPot(sMsg.begin(), sMsg.end(), rPotPattern); itPot != end; ++itPot)
			{
				std::string sPot = *itPot;
				if (std::regex_search(sPot, rPotRet, rPotPattern))
				{
					CPoint pot;
					pot.x = atoi(rPotRet[1].str().c_str());
					pot.y = atoi(rPotRet[2].str().c_str());
					vecPot.push_back(pot);
				}
			}
		}
	}
	return sMsg;
}

int main()
{
	mapColorInit();

	std::vector<CPoint> vecPot;
	std::string text = "<heros1>sixi</heros1><location>(11,11)</location><location>(22,22)</location>";
	std::string sRet = regexDeal(text, GmapColor, vecPot);
	std::cout <<"Input:" << text << std::endl;
	std::cout << "Out:"<<sRet << std::endl;

	for (std::vector<CPoint>::iterator it = vecPot.begin(); it != vecPot.end(); it++)
	{
		std::cout << it->x << std::endl;
		std::cout << it->y << std::endl;
	}
	return 0;
}

运行效果