如何使用正则表达式等在C＃中处理文本框/富文本框中的文本

Question

Original Text in the txtinput will look in this format

Firstportion Seconportion
Firstportion Seconportion
Firstportion Seconportion
Firstportion Seconportion

1. My Goal is to first split each lines into two variable and add them to an array or list or whatever works [number of lines are variable so array will not work]

   var1[] = firstportion, var2=seconportion //so far looks like working for the 1st entry

2. put those to variable array/list [Not working with the loops i currently have]

3. the process the first portions seperately and second portion seperatly with conditional if and regural expression and displaythem all back in the 2nd txtbox

    using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Windows.Forms; using System.IO; using System.Collections; using System.Text.RegularExpressions; namespace Projectx { public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void button1_Click(object sender, EventArgs e) { string rawInput = txtInput.Text; //string[] rawInput = txtInput.Text.Split('\\n'); int x = 1; int y = 1; foreach (string line in txtInput.Lines) { string firstPortion= ""; string secondPortion = ""; string[] splitInput = Regex.Split(rawInput, ("\\\\s+")); firstPortion= splitInput[0]; secondPortion = splitInput[1]; //##### This works so far ans splits each line into two variables seperated by 1 white space but not sure if it works for 2nd line and seems can't assign these new splited values into two seperate array or list with the same loop or seperate loop //List<int> list = new List<int>; //(arr) List<string> myList1 = new List<string>(); List<string> myList2 = new List<string>(); myList1.Add(firtPortion); myList2.Add(secondPortion); txtOutPut.Text = "modified " + myList1[x] + " " + myList2[y]+"\\r\\n"; int i = 1; i++; x++; y++; } } } } 

Answer 1

Try declaring your :

            List<string> myList1 = new List<string>();
            List<string> myList2 = new List<string>();

outside the foreach loop.

Answer 2

There seems to be two big problems.

1. You're creating a new pair of lists in each iteration rather than adding new items to the same list.
2. You're splitting the rawInput variable in each iteration rather than the current line .

There are also a number of smaller ones mostly having to do with extraneous or unused variables.

Try something like this:

List<string> myList1 = new List<string>();
List<string> myList2 = new List<string>();
int x = 0;
foreach (string line in txtInput.Lines)
{
    string[] splitInput = Regex.Split(line, ("\\s+"));
    myList1.Add(splitInput[0]);
    myList2.Add(splitInput[1]);
    txtOutPut.Text += "modified " + myList1[x] + "  " + myList2[x] + Environment.NewLine;
    x++;
}

Answer 3

1. The List should be declared outside the loop
2. Why do you use rawInput ? Instead you have to use line to do the Split

3. You dont need the local variables(x,y) instead you could use LastOrDefault()

     List<string> myList1 = new List<string>(); List<string> myList2 = new List<string>(); string rawInput = txtInput.Text; foreach (string line in txtInput.Lines) { string firstPortion = ""; string secondPortion = ""; string[] splitInput = Regex.Split(line, ("\\\\s+")); firstPortion = splitInput[0]; secondPortion = splitInput[1]; myList1.Add(firstPortion); myList2.Add(secondPortion); txtOutPut.Text = "modified " + myList1.LastOrDefault() + " " + myList2.LastOrDefault() + "\\r\\n"; }