C 簡單的正則

本人初學c++ 如有遺漏和錯誤，望斧正！

本文只是簡單的介紹一下c++對txt檔案的簡單讀和寫

希望大家喜歡

給個贊就最好了

(。・∀・)ノ

在windows下讀取txt檔案時往往需要從中提取一些內容，比如gps模組返回日誌的txt檔案中經緯度的提取

$gnrmc,071550.000,a,2325.0070,n,11637.7624,e,000.0,000.0,170920,a*7f

因此為了方便我們可以利用簡單的正則將其輸出

gps檔案內容名稱為gpstest.txt

$gnrmc,071549.000,a,2325.0070,n,11637.7624,e,000.0,000.0,170920,,,a*77 $gnrmc,071549.200,a,2325.0070,n,11637.7624,e,000.0,000.0,170920,,,a*75 $gnrmc,071549.400,a,2325.0070,n,11637.7624,e,000.0,000.0,170920,,,a*73 $gnrmc,071549.600,a,2325.0070,n,11637.7624,e,000.0,000.0,170920,,,a*71 $gnrmc,071549.800,a,2325.0070,n,11637.7624,e,000.0,000.0,170920,,,a*7f $gnrmc,071550.000,a,2325.0070,n,11637.7624,e,000.0,000.0,170920,,,a*7f $gnrmc,071550.200,a,2325.0070,n,11637.7624,e,000.0,000.0,170920,,,a*7d $gnrmc,071550.400,a,2325.0070,n,11637.7624,e,000.0,000.0,170920,,,a*7b $gnrmc,071550.600,a,2325.0070,n,11637.7624,e,000.0,000.0,170920,,,a*79 $gnrmc,071550.800,a,2325.0070,n,11637.7624,e,000.0,000.0,170920,,,a*77 $gnrmc,071551.000,a,2325.0070,n,11637.7624,e,000.0,000.0,170920,,,a*7e $gnrmc,071551.200,a,2325.0070,n,11637.7624,e,000.0,000.0,170920,,,a*7c $gnrmc,071551.400,a,2325.0070,n,11637.7624,e,000.0,000.0,170920,,,a*7a $gnrmc,071551.600,a,2325.0070,n,11637.7624,e,000.0,000.0,170920,,,a*78

#include

其中擁有正則運算相關的函式

string str = "hello_2018";
smatch result;//regex專用儲存
regex pattern("(.)_(\\d)"); //匹配5個任意單字元 + 下劃線 + 4個數字
if (regex_match(str, result, pattern))
string inf;
regex pattern1("\\d.\\d,\\w");
regex pattern2("\\d.\\d,\\w");
smatch result1;
smatch result2;
while (getline(infile, inf))//getline(input,string(content)) 之所以不用 infile.get(ch) 和 infile.getline(ch,number)是因為其儲存的是char和char陣列
}} infile.close();
system("pause");
return 0 ;
}

c++檔案的簡單讀取

結果如圖所示

C 簡單的正則

正則的簡單運用

正則簡單封裝

簡單的正則表達示。

C 簡單的正則

正則的簡單運用

正則簡單封裝

簡單的正則表達示。

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