使用 C# 4.8：从字符串数组或字符串列表中删除与字符串模式匹配的项目的最有效方法

Question

I need to remove items from the list that match a collection of string patterns. If needed, I can loop through the list/array of patterns to remove rather than matching all of them at once.

Note: the string patterns are dynamic and we don't know what will be passed in.
We do know the patterns can have Asterisk and/or Question Marks, and have the same function as in:

System.IO.Directory.GetFiles(, );

Where ?xyz.txt would find 1xyz.txt , 2xyz.txt , but not 12xyz.txt and not xyz.txt

This is what I came up with which does not work.

string exclude = "*yf*";
List<string> listRemaining = listAll.Where(x => !listAll.Contains(exclude)).ToList();

This is an example of patterns for items to remove from the list:

*yf*

*xName.txt

?MyFileName*

And this is a sample list of strings where we need to remove items matching the 3 patterns above:

AyFileName.log
AyFilexName.txt
ByFilexName.log
ByFileName.txt
zMyFileName.log
zMyFileName.txt
SomeFancyFileName.log
SomeFancyFileName.txt
TodayFileName.log
TodayFileName.txt
UglyFileName.log
UglyFileName.txt

Items to be removed?

Pattern to remove: *yf*

will remove:

`SomeFancyFileName.log`
`SomeFancyFileName.txt`
`UglyFileName.log`
`UglyFileName.txt`

Pattern to remove: *xName.txt

will remove: AyFilexName.txt

Pattern to remove: ?MyFileName*

will remove: zMyFileName.log zMyFileName.txt

Thank you.

Answer 1

The best solution would be the File globbing as @jwdonahue mentioned.

https://learn.microsoft.com/en-us/do.net/core/extensions/file-globbing

But if you want to build your own solution for that, this might be a start.

public static IEnumerable<string> Filter(string pattern, IEnumerable<string> list) {
    return list.Where(e =>!Match(pattern, e));
}

public static bool Match(string pattern, string input) {
    var modifiedPattern = pattern
        .Replace(@"\", @"\\")
        .Replace(".", @"\.")
        .Replace("*", ".*")
        .Replace("?", ".");
    modifiedPattern = "^" + modifiedPattern + "$";
    return Regex.IsMatch(input, modifiedPattern, RegexOptions.IgnoreCase);
}

Which you can call like

    var filterPattern = "?MyFileName*";
    var listRemaining = Filter(filterPattern, listAll).ToList();