我正在尝试删除数据框的一个字符串元素中存在的“+”字符。但我无法找到解决方法。
以下是数据框。
using ISTE.Models;
using ISTE.ViewModels;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
namespace ISTE.Views
{
/// <summary>
/// Interaction logic for CoursesView.xaml
/// </summary>
public partial class CoursesView : UserControl
{
CoursesVM vm;
public CoursesView()
{
InitializeComponent();
vm = new CoursesVM();
this.DataContext = vm;
vm.GetData();
}
bool flag=false;
bool flag1=false;
private void UnderGraduate_Click(object sender1, RoutedEventArgs e1)
{
if (flag1 == false)
{
foreach (Undergraduate grad in vm.ItemData.undergraduate)
{
var textb = new Button();
undergradpanel.Children.Add(textb);
textb.Content = grad.degreeName;
textb.Click += new RoutedEventHandler(ugdegreeEventHandler);
Console.WriteLine("graddegrees \t" + grad.degreeName);
}
}
flag1 = true;
}
void ugdegreeEventHandler(object sender2, RoutedEventArgs e2)
{
// Console.WriteLine("hi select");
var b = sender2 as Button;
// var textb2 = new TextBlock();
// textb2.Text
myBorder1.Background = Brushes.SkyBlue;
myBorder1.BorderBrush = Brushes.Blue;
myBorder1.BorderThickness = new Thickness(2);
myBorder1.CornerRadius = new CornerRadius(8);
myBorder1.Padding = new Thickness(6);
var degreeselected = b.Content.ToString();
if (undergradpaneldesc.Children.Count < 1)
{
var textb2 = new TextBlock();
textb2.Name = "textblock";
undergradpaneldesc.Children.Add(textb2);
foreach (Undergraduate grad in vm.ItemData.undergraduate)
{
if (grad.degreeName == degreeselected)
{
textb2.TextDecorations = TextDecorations.Underline;
textb2.Text = grad.description+"\n\n";
textb2.TextWrapping = TextWrapping.Wrap;
return;
}
}
}
else
{
foreach (Undergraduate grad in vm.ItemData.undergraduate)
{
if (grad.degreeName == degreeselected)
{
foreach (TextBlock ch in undergradpaneldesc.Children)
{
ch.Text = "";
ch.TextDecorations = TextDecorations.Underline;
ch.Text = grad.description+"\n\n";
ch.TextWrapping = TextWrapping.Wrap;
return;
}
}
}
}
}
private void Graduate_Click(object sender, RoutedEventArgs e)
{
if (flag == false)
{
foreach (Graduate grad in vm.ItemData.graduate)
{
var textb = new Button();
gradpanel.Children.Add(textb);
textb.Content = grad.degreeName;
textb.IsDefault = true;
textb.Click += new RoutedEventHandler(degreeEventHandler);
Console.WriteLine("graddegrees \t" + grad.degreeName);
}
}
flag = true;
}
void degreeEventHandler(object sender, RoutedEventArgs e)
{
// Console.WriteLine("hi select");
var b = sender as Button;
// var textb2 = new TextBlock();
// textb2.Text
var degreeselected = b.Content.ToString();
myBorder2.Background = Brushes.SkyBlue;
myBorder2.BorderBrush = Brushes.Black;
myBorder2.BorderThickness = new Thickness(2);
myBorder2.CornerRadius = new CornerRadius(8);
myBorder2.Padding = new Thickness(6);
if (gradpaneldesc.Children.Count<1)
{
var textb1 = new TextBlock();
textb1.Name = "textblock1";
gradpaneldesc.Children.Add(textb1);
foreach (Graduate grad in vm.ItemData.graduate)
{
if (grad.degreeName == degreeselected)
{
if (grad.degreeName != "graduate advanced certificates")
{
textb1.Text = grad.description;
textb1.TextDecorations = TextDecorations.Underline;
foreach (var conc in grad.concentrations)
{
textb1.Text += conc + "\n\n";
}
textb1.TextWrapping = TextWrapping.Wrap;
return;
}
else
{
textb1.TextDecorations = TextDecorations.Underline;
foreach (var conc in grad.availableCertificates)
{
textb1.Text += conc + "\n\n";
}
textb1.TextWrapping = TextWrapping.Wrap;
return;
}
}
}
}
else
{
foreach (Graduate grad in vm.ItemData.graduate)
{
if (grad.degreeName == degreeselected)
{
if (grad.degreeName != "graduate advanced certificates")
{
foreach (TextBlock ch in gradpaneldesc.Children)
{
ch.Text = "";
ch.Text = grad.description + "\n\n";
ch.TextDecorations = TextDecorations.Underline;
foreach (var conc in grad.concentrations)
{
ch.Text += conc + "\n";
}
ch.TextWrapping = TextWrapping.Wrap;
return;
}
}
else
{
foreach (TextBlock ch in gradpaneldesc.Children)
{
ch.Text = "";
ch.TextDecorations = TextDecorations.Underline;
foreach (var conc in grad.availableCertificates)
{
ch.Text += conc + "\n";
}
ch.TextWrapping = TextWrapping.Wrap;
return;
}
}
}
}
}
}
private void Certifications_Click(object sender, RoutedEventArgs e)
{
var textb3 = new TextBlock();
textb3.Name = "textblock3";
certificatedesc.Children.Add(textb3);
textb3.TextDecorations = TextDecorations.Underline;
myBorder3.Background = Brushes.SkyBlue;
myBorder3.BorderBrush = Brushes.Black;
myBorder3.BorderThickness = new Thickness(2);
myBorder3.CornerRadius = new CornerRadius(8);
myBorder3.Padding = new Thickness(6);
foreach (Graduate grad in vm.ItemData.graduate)
{
if (grad.degreeName == "graduate advanced certificates")
{
textb3.Text = grad.description;
textb3.TextDecorations = TextDecorations.Underline;
foreach (var conc in grad.availableCertificates)
{
textb3.Text += conc + "\n\n";
}
textb3.TextWrapping = TextWrapping.Wrap;
return;
}
}
}
}
}
我尝试了两种方法，但都没有达到预期效果：
WAY1
txtdf <- structure(list(ID = 1:9, Var1 = structure(c(1L, 1L, 1L, 1L, 4L,
5L, 5L, 2L, 3L), .Label = c("government", "parliament", "parliment",
"poli+tician", "politician"), class = "factor")), .Names = c("ID",
"Var1"), class = "data.frame", row.names = c(NA, -9L))
# ID Var1
# 1 government
# 2 government
# 3 government
# 4 government
# 5 poli+tician
# 6 politician
# 7 politician
# 8 parliament
# 9 parliment
我不明白这里有什么问题。我希望'+'字符单独替换为第5个元素没有值，但所有元素都按上述方式编辑。
Way2
txtdf <- gsub("[:punct:]","", txtdf)
# [1] "goverme" "goverme" "goverme" "goverme" "oli+iia" "oliiia" "oliiia"
# [8] "arliame" "arlime"
这里根本没有变化。我想我试过的是，我试图用双斜线逃避+字符。
答案 0 :(得分：1)
你需要逃避你的加号，“+”在正则表达式方面具有特殊意义（它是量词），因此不能被视为标点符号，来自文档：?regex < / p>
“+”前面的项目将匹配一次或多次。
为了匹配这些特殊字符，你需要逃避它们，以便它们的含义可以从字面上理解，因此它们的特殊含义不会被翻译。在R中你需要两个反斜杠（\）才能逃脱。所以在你的情况下，这将是：
gsub("\\+","",df$job)
通过删除数据中的所有加号，
将在上面运行，从而为您提供所需的结果所以假设你的df是：
df <- data.frame(job = c("government", "poli+tician","politician", "parliament"))
然后你的输出将是：
> gsub("\\+","",df$job)
[1] "government" "politician" "politician"
[4] "parliament"
答案 1 :(得分：0)
只需将其替换为fixed = TRUE（无需使用正则表达式），但您必须为每个＆＃34;列替换＃34;通过指定列名称来指定data.frame：
txtdf <- data.frame(job = c("government", "poli+tician", "parliament"))
txtdf
给出
job
1 government
2 poli+tician
3 parliament
现在替换＆＃34; +＆＃34;：
txtdf$job <- gsub("+", "", txtdf$job, fixed = TRUE)
txtdf
结果是：
job
1 government
2 politician
3 parliament