c#正则表达式替换问题

本文关键字：问题 替换 正则表达式 | 更新日期: 2023-09-27 18:19:09

我正试图编写一个程序，可以替换文本和替换也Regex文本。所以我有麻烦与正则表达式替换部分。我是一个真正的新手:)

private void button2_Click(object sender, EventArgs e)
{
    if (File.Exists(textBox1.Text))
    {

//这是正则替换:

        if (checkBox1.Checked == false)
        {
            StreamReader sr = new StreamReader(textBox1.Text);
            StreamWriter sw = new StreamWriter(textBox1.Text.Replace(".", "_new."));
            string cur = "";
            do
            {
                cur = sr.ReadLine();
                cur = cur.Replace(textBox2.Text, textBox3.Text);
                sw.WriteLine(cur);
            }
            while (!sr.EndOfStream);
            sw.Close();
            sr.Close();
            MessageBox.Show("Finished, the new file is in the same directory as the old one");
        }

//这是REGEX替换:

        if (checkBox1.Checked == true)
        {
            System.Text.RegularExpressions.Regex g = new Regex(@textBox2.Text);
            using (StreamReader r = new StreamReader(textBox1.Text))
            {
                StreamReader sr = new StreamReader(textBox1.Text);
                StreamWriter sw = new StreamWriter(textBox1.Text.Replace(".", "_new."));
                string cur = "";
                do
                {
                    cur = sr.ReadLine();
                    cur = cur.Replace(textBox2.Text, textBox3.Text);
                    sw.WriteLine(cur);
                }
                while (!sr.EndOfStream);
                sw.Close();
                sr.Close();
            }
            MessageBox.Show("Finished, the new file is in the same directory as the old one");
        }

        button2.Enabled = false;
    }
    if (File.Exists(textBox1.Text) == false)
    {
    MessageBox.Show("Please select a file and try again.");
    }
}

c#正则表达式替换问题

Regex替换函数可以在MSDN正则表达式替换文档中找到。

使用:Regex.Replace(input, pattern, replacement); 

string inputFilename = textBox1.Text;
string outputFilename = inputFilename.Replace(".", "_new.");
string regexPattern = textBox2.Text;
string replaceText = textBox3.Text;
using (StreamWriter sw = new StreamWriter(outputFilename)))
{
    foreach (string line in File.ReadAllLines(inputFilename))
    {
        string newLine = Regex.Replace(line, regexPattern, replaceText);
        sw.WriteLine(newLine);
    }
}
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