c# - 一种使用 RegEx 在字符串中查找一组文件名路径的方法

Question

大家早上好

有没有一种在 C# 中使用正则表达式来查找 string 变量中的所有文件名及其路径的好方法？

例如，如果你有这个字符串:

string s = @"Hello John

these are the files you have to send us today: <file>C:\Development\Projects 2010\Accounting\file20101130.csv</file>, <file>C:\Development\Projects 2010\Accounting\orders20101130.docx</file>

also we would like you to send <file>C:\Development\Projects 2010\Accounting\customersupdated.xls</file>

thank you";

结果是:

C:\Development\Projects 2010\Accounting\file20101130.csv
C:\Development\Projects 2010\Accounting\orders20101130.docx
C:\Development\Projects 2010\Accounting\customersupdated.xls

已编辑:考虑到告诉@Jim 的内容，我编辑了添加标签的字符串，以便更容易地从字符串中提取所需的文件名!

Answer 1

这是我想出的东西:

using System;
using System.Text.RegularExpressions;

public class Test
{

    public static void Main()
    {
        string s = @"Hello John these are the files you have to send us today: 
            C:\projects\orders20101130.docx also we would like you to send 
            C:\some\file.txt, C:\someother.file and d:\some file\with spaces.ext  

            Thank you";

        Extract(s);

    }

    private static readonly Regex rx = new Regex
        (@"[a-z]:\\(?:[^\\:]+\\)*((?:[^:\\]+)\.\w+)", RegexOptions.IgnoreCase);

    static void Extract(string text)
    {
        MatchCollection matches = rx.Matches(text);

        foreach (Match match in matches)
        {
            Console.WriteLine("'{0}'", match.Value);
        }
    }

}

产生:(参见ideone)

'C:\projects\orders20101130.docx', file: 'orders20101130.docx'
'C:\some\file.txt', file: 'file.txt'
'C:\someother.file', file: 'someother.file'
'd:\some file\with spaces.ext', file: 'with spaces.ext'

正则表达式不是非常健壮(它确实做了一些假设)但它也适用于您的示例。

---

如果您使用 <file>，这里是程序的一个版本标签。更改正则表达式和 Extract到:

private static readonly Regex rx = new Regex
    (@"<file>(.+?)</file>", RegexOptions.IgnoreCase);

static void Extract(string text)
{
    MatchCollection matches = rx.Matches(text);

    foreach (Match match in matches)
    {
        Console.WriteLine("'{0}'", match.Groups[1]);
    }
}

也可在 ideone 上获得.