正则表达式完全匹配问题

[shencui0371]

做的是文件查找的小程序，当输入查找的文件名如：sc.txt时，包含sc字母的文本如discuss.txt也会出现在查找结果中，请问高手们只是怎么回事啊？急！！我的程序：using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.IO;
using System.Text.RegularExpressions;


namespace scui
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}

private void button1_Click(object sender, EventArgs e)
{
this.Close();
}

private void start_Click(object sender, EventArgs e)
{
jieguo.Text = String.Empty;

zhaodao.Text = String.Empty;



try
{
//创建一个DirectoryInfo对象
DirectoryInfo dir = new DirectoryInfo(mulu.Text);
//基于用户输入的文件名创建一个Regex实例
Regex regex = new Regex(filename.Text);

if (dir.Exists == true)
{
//如果存在，显示初始文本，在调用FindFile方法，
//并将DirectoryInfo对象和格式规范字符串作为参数传递给它
jieguo.Text = "Starting Directory: " + mulu.Text + "\r\n";
jieguo.Text += "Searching for file: " + filename.Text + "\r\n";

jieguo.Text += new String('-',50) + "\r\n";
//光标设置为沙漏图标
this.Cursor = Cursors.WaitCursor;
FindFile(dir, regex);
}
else
{
jieguo.Text = "请从现有的磁盘开始查找!";
}
}
catch (Exception excep)
{
MessageBox.Show(excep.Message);
}
finally
{

//光标恢复正常
this.Cursor = Cursors.Default;
if (zhaodao.Text == String.Empty)
zhaodao.Text = "没有匹配的文件!";

}
}
//控制目录的分层次显示
static int indent = -10;

//递增缩进量，显示当前DirectoryInfo实例的信息

private void FindFile(DirectoryInfo dir, Regex regex)
{
indent += 10;

jieguo.Text += new String(' ', indent) + dir.Name + " " +
dir.LastAccessTime + "\r\n";
//DirectoryInfo实例的GetFiles方法将当前目录文件读到FileInfo对象数组中

FileInfo[] filesInDir = dir.GetFiles();

DirectoryInfo[] dirs = dir.GetDirectories();

foreach (FileInfo fi in filesInDir)
{
Match match = regex.Match(fi.Name);

if (match.Success)
{
if (filename.Text != String.Empty)

{
zhaodao.Text += fi.FullName + " " +fi.Length + " " + "\r\n";
}

}
}
//匹配文件
foreach (DirectoryInfo dir2 in dirs)
{
Match match1 = regex.Match(dir2.Name);

if (match1.Success)
{
if (filename.Text != String.Empty)
{
zhaodao.Text += dir2.FullName + "文件夹" + " " + "\r\n";
}
}
}
//对子目录进行递归调用 FindFile方法

foreach (DirectoryInfo di in dirs)
{
FindFile(di, regex);
}
indent -= 10;
}

private void txtFilesFound_TextChanged(object sender, EventArgs e)
{

}

private void filename_TextChanged(object sender, EventArgs e)
{

}

private void Form1_Load(object sender, EventArgs e)
{

}

private void jieguo_TextChanged(object sender, EventArgs e)
{

}


}
}

[珍惜生命远离CPP]

^字符串开始
$字符串结束

[smallfz]

^sc\.txt$

[周公]

[Quote=引用 2 楼 smallfz 的回复:]
^sc\.txt$
[/Quote]
正则表达式应该这么写。

[root_]

完全看不出有什么用正则的必要

直接字符串比较不可以吗。。。

[marvelstack]

Regex regex = new Regex(@"^sc\.txt$");

[amaxiaopeng]

Regex reg = new Regex(@"([\s\b])(sc\.txt)([\s\b])", RegexOptions.IgnoreCase);
Match match = reg.Match(urlText);
string strResult = match.Result("$2").ToString();