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QT利用lamda正则表达式取出字符串中的浮点数与整数

發布時間：2025/4/5 c/c++ 37 豆豆

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文章目錄

前言
一、待取的數據格式
二、Qt使用正則表達式
- 1.加入頭文件
- 2.cpp中代碼
- 2.讀取到的數據
總結

前言

利用正則表達式實現取出一串字符串中的浮點數與正整數

一、待取的數據格式

以下為待匹配的原始數據

二、Qt使用正則表達式

1.加入頭文件

代碼如下：

#include <QFile> #include <QDebug>

2.cpp中代碼

QString displayString;QFile file("E:/QTCode/QTlamda/wpt_test.WPT"); //打開文件if(!file.open(QIODevice::ReadOnly | QIODevice::Text)){qDebug()<<"Can't open the file!"<<endl;}while(!file.atEnd()) //一行一行讀取直到結束{QByteArray line = file.readLine();QString str(line);qDebug()<< str;displayString.append(str);}qDebug()<<displayString;// QString pattern("\\d{1,5}");//任意一個數字，0~9 中的任意一個正則表達式提取“[XXX]”,XXX為任意字符串。QString pattern("\\d+(\\.\\d+)|-?\\d+"); //匹配字符串中所有的浮點數以及整數 // QString pattern("^(\\d){0,3}(\\.\\d{0,2})?$");QRegExp rx(pattern);rx.setMinimal(false);//--1 提取字符串QStringList list;int pos = 0;while ((pos = rx.indexIn(displayString, pos)) != -1){list.append(rx.cap(0)); //把提取到的字符串保存下來pos += rx.matchedLength();}qDebug()<<list;

2.讀取到的數據

這里是一行一行讀取時候輸出的結果（這一行語句的輸出）：

"<auvroute id=\"oligei\" loop=\"loop\" count=\"23\">\n" "<routepoint index=\"1\" latitude=\"14.4449\" longitude=\"117.053\" Depth=\"100.0\" Section_Sum=\"10\" Point_CtrL=\"27\" Main_Propulsion_rpm=\"0.0\" SampleTime=\"50.0\" Task_Ctrl=\"0\"/>\r\n" "<routepoint index=\"2\" latitude=\"14.4449\" longitude=\"117.053\" Depth=\"100.0\" Section_Sum=\"10\" Point_CtrL=\"27\" Main_Propulsion_rpm=\"0.0\" SampleTime=\"50.0\" Task_Ctrl=\"0\"/>\r\n" "<routepoint index=\"3\" latitude=\"14.4449\" longitude=\"117.053\" Depth=\"100.0\" Section_Sum=\"10\" Point_CtrL=\"27\" Main_Propulsion_rpm=\"0.0\" SampleTime=\"50.0\" Task_Ctrl=\"0\"/>\r\n" "<routepoint index=\"4\" latitude=\"14.4449\" longitude=\"117.053\" Depth=\"100.0\" Section_Sum=\"10\" Point_CtrL=\"27\" Main_Propulsion_rpm=\"0.0\" SampleTime=\"50.0\" Task_Ctrl=\"0\"/>\r\n" "<routepoint index=\"5\" latitude=\"14.4449\" longitude=\"117.053\" Depth=\"100.0\" Section_Sum=\"10\" Point_CtrL=\"27\" Main_Propulsion_rpm=\"0.0\" SampleTime=\"50.0\" Task_Ctrl=\"0\"/>\r\n" "<routepoint index=\"6\" latitude=\"14.4449\" longitude=\"117.053\" Depth=\"100.0\" Section_Sum=\"10\" Point_CtrL=\"27\" Main_Propulsion_rpm=\"0.0\" SampleTime=\"50.0\" Task_Ctrl=\"0\"/>\r\n" "<routepoint index=\"7\" latitude=\"14.4449\" longitude=\"117.053\" Depth=\"100.0\" Section_Sum=\"10\" Point_CtrL=\"27\" Main_Propulsion_rpm=\"0.0\" SampleTime=\"50.0\" Task_Ctrl=\"0\"/>\r\n" "<routepoint index=\"8\" latitude=\"14.4449\" longitude=\"117.053\" Depth=\"100.0\" Section_Sum=\"10\" Point_CtrL=\"27\" Main_Propulsion_rpm=\"0.0\" SampleTime=\"50.0\" Task_Ctrl=\"0\"/>\r\n" "<routepoint index=\"9\" latitude=\"14.4449\" longitude=\"117.053\" Depth=\"100.0\" Section_Sum=\"10\" Point_CtrL=\"27\" Main_Propulsion_rpm=\"0.0\" SampleTime=\"50.0\" Task_Ctrl=\"0\"/>\r\n" "<routepoint index=\"10\" latitude=\"14.4449\" longitude=\"117.053\" Depth=\"100.0\" Section_Sum=\"10\" Point_CtrL=\"27\" Main_Propulsion_rpm=\"0.0\" SampleTime=\"50.0\" Task_Ctrl=\"0\"/>\r\n" "<routepoint index=\"11\" latitude=\"14.4449\" longitude=\"117.053\" Depth=\"100.0\" Section_Sum=\"10\" Point_CtrL=\"27\" Main_Propulsion_rpm=\"0.0\" SampleTime=\"50.0\" Task_Ctrl=\"0\"/>\r\n" "<routepoint index=\"12\" latitude=\"14.4449\" longitude=\"117.053\" Depth=\"100.0\" Section_Sum=\"10\" Point_CtrL=\"27\" Main_Propulsion_rpm=\"0.0\" SampleTime=\"50.0\" Task_Ctrl=\"0\"/>\r\n" "<routepoint index=\"13\" latitude=\"14.4449\" longitude=\"117.053\" Depth=\"100.0\" Section_Sum=\"10\" Point_CtrL=\"27\" Main_Propulsion_rpm=\"0.0\" SampleTime=\"50.0\" Task_Ctrl=\"0\"/>\r\n" "<routepoint index=\"14\" latitude=\"14.4449\" longitude=\"117.053\" Depth=\"100.0\" Section_Sum=\"10\" Point_CtrL=\"27\" Main_Propulsion_rpm=\"0.0\" SampleTime=\"50.0\" Task_Ctrl=\"0\"/>\r\n" "<routepoint index=\"15\" latitude=\"14.4449\" longitude=\"117.053\" Depth=\"100.0\" Section_Sum=\"10\" Point_CtrL=\"27\" Main_Propulsion_rpm=\"0.0\" SampleTime=\"50.0\" Task_Ctrl=\"0\"/>\r\n" "<routepoint index=\"16\" latitude=\"14.4449\" longitude=\"117.053\" Depth=\"100.0\" Section_Sum=\"10\" Point_CtrL=\"27\" Main_Propulsion_rpm=\"0.0\" SampleTime=\"50.0\" Task_Ctrl=\"0\"/>\r\n" "<routepoint index=\"17\" latitude=\"14.4449\" longitude=\"117.053\" Depth=\"100.0\" Section_Sum=\"10\" Point_CtrL=\"27\" Main_Propulsion_rpm=\"0.0\" SampleTime=\"50.0\" Task_Ctrl=\"0\"/>\r\n" "<routepoint index=\"18\" latitude=\"14.4449\" longitude=\"117.053\" Depth=\"100.0\" Section_Sum=\"10\" Point_CtrL=\"27\" Main_Propulsion_rpm=\"0.0\" SampleTime=\"50.0\" Task_Ctrl=\"0\"/>\r\n" "<routepoint index=\"19\" latitude=\"14.4449\" longitude=\"117.053\" Depth=\"100.0\" Section_Sum=\"10\" Point_CtrL=\"27\" Main_Propulsion_rpm=\"0.0\" SampleTime=\"50.0\" Task_Ctrl=\"0\"/>\r\n" "<routepoint index=\"20\" latitude=\"14.4449\" longitude=\"117.053\" Depth=\"100.0\" Section_Sum=\"10\" Point_CtrL=\"27\" Main_Propulsion_rpm=\"0.0\" SampleTime=\"50.0\" Task_Ctrl=\"0\"/>\r\n" "<routepoint index=\"21\" latitude=\"14.4449\" longitude=\"117.053\" Depth=\"100.0\" Section_Sum=\"10\" Point_CtrL=\"27\" Main_Propulsion_rpm=\"0.0\" SampleTime=\"50.0\" Task_Ctrl=\"0\"/>\r\n" "<routepoint index=\"22\" latitude=\"14.4449\" longitude=\"117.053\" Depth=\"100.0\" Section_Sum=\"10\" Point_CtrL=\"27\" Main_Propulsion_rpm=\"0.0\" SampleTime=\"50.0\" Task_Ctrl=\"0\"/>\r\n" "<routepoint index=\"23\" latitude=\"14.4449\" longitude=\"117.053\" Depth=\"100.0\" Section_Sum=\"10\" Point_CtrL=\"27\" Main_Propulsion_rpm=\"0.0\" SampleTime=\"50.0\" Task_Ctrl=\"0\"/>\r\n" "</auvroute>"

以下為使用正則表達式匹配的輸出。

("23", "1", "14.4449", "117.053", "100.0", "10", "27", "0.0", "50.0", "0", "2", "14.4449", "117.053", "100.0", "10", "27", "0.0", "50.0", "0", "3", "14.4449", "117.053", "100.0", "10", "27", "0.0", "50.0", "0", "4", "14.4449", "117.053", "100.0", "10", "27", "0.0", "50.0", "0", "5", "14.4449", "117.053", "100.0", "10", "27", "0.0", "50.0", "0", "6", "14.4449", "117.053", "100.0", "10", "27", "0.0", "50.0", "0", "7", "14.4449", "117.053", "100.0", "10", "27", "0.0", "50.0", "0", "8", "14.4449", "117.053", "100.0", "10", "27", "0.0", "50.0", "0", "9", "14.4449", "117.053", "100.0", "10", "27", "0.0", "50.0", "0", "10", "14.4449", "117.053", "100.0", "10", "27", "0.0", "50.0", "0", "11", "14.4449", "117.053", "100.0", "10", "27", "0.0", "50.0", "0", "12", "14.4449", "117.053", "100.0", "10", "27", "0.0", "50.0", "0", "13", "14.4449", "117.053", "100.0", "10", "27", "0.0", "50.0", "0", "14", "14.4449", "117.053", "100.0", "10", "27", "0.0", "50.0", "0", "15", "14.4449", "117.053", "100.0", "10", "27", "0.0", "50.0", "0", "16", "14.4449", "117.053", "100.0", "10", "27", "0.0", "50.0", "0", "17", "14.4449", "117.053", "100.0", "10", "27", "0.0", "50.0", "0", "18", "14.4449", "117.053", "100.0", "10", "27", "0.0", "50.0", "0", "19", "14.4449", "117.053", "100.0", "10", "27", "0.0", "50.0", "0", "20", "14.4449", "117.053", "100.0", "10", "27", "0.0", "50.0", "0", "21", "14.4449", "117.053", "100.0", "10", "27", "0.0", "50.0", "0", "22", "14.4449", "117.053", "100.0", "10", "27", "0.0", "50.0", "0", "23", "14.4449", "117.053", "100.0", "10", "27", "0.0", "50.0", "0")

總結

這里只是簡單實現了正則表達式的應用，具體使用還是得看一下正則表達式的原理。
可以在這里在線測試自己的正則表達式
正則表達式在線測試

總結

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