I want to compare if one file is in two different folders.
var reg = new Regex(@"TC__\d{3,4}_8exp$");
var reg1 = new Regex(@"TC_\d{3,4}$");
var FileNames_List_Jetzt_Dateien = Directory.GetFiles(@"PATH2", "*.html")
.Where(path => reg.IsMatch(Path.GetFileNameWithoutExtension(path)))
.Select(Folder_Jetzt_Dateien =>
Path.GetFileNameWithoutExtension(Folder_Jetzt_Dateien));
From this one I am getting list :
TC__6493_8exp
TC__6494_8exp
TC__6495_8exp...
From this one:
var TEST_FÄLLE = Directory.GetFiles(@"PATH2", "*.exp")
.Where(path => reg1.IsMatch(Path.GetFileNameWithoutExtension(path)))
.Select(Folder_Jetzt_Dateien =>
Path.GetFileNameWithoutExtension(Folder_Jetzt_Dateien));
I am getting list:
TC_6493
TC_6494
TC_6495...
For me the TC__6493_8exp is the same with TC_6493. How to use Intersect for these two lists with the same elements?
Here is a way to write the custom comparer with a regex:
public static Regex rx = new Regex(@"^(TC_)_?(\d+).*", RegexOptions.Compiled);
public class FilePathComparer : IEqualityComparer<string>
{
public bool Equals(string x, string y)
{
return rx.Replace(x, "$1$2") == rx.Replace(y, "$1$2");
}
public int GetHashCode(string s)
{
return rx.Replace(s,"$1$2").GetHashCode();
}
}
In the code later, just use
var intersected = FileNames_List_Jetzt_Dateien.Intersect(TEST_FÄLLE, new FilePathComparer());
See the C# demo and the regex demo.
The ^(TC_)_?(\d+).* regex matches
^ - start of string(TC_) - Group 1 ($1): TC__? - an optional underscore(\d+) - Group 2 ($2): one or more digits.* - the rest of the string.You can write custom comparer and pass it to Intersect method
using System.Collections.Generic;
class FileComparer : IEqualityComparer<string>
{
const string ext = "_exp8";
public bool Equals(string left, string right)
{
if (left.EndsWith(ext) && !right.EndsWith(ext))
{
return StripExt(left) == right;
}
else if (right.EndsWith(ext))
{
return left == StripExt(right);
}
return left == right;
}
private static string StripExt(string s)
=> s.Substring(0, s.Length - ext.Length);
public int GetHashCode(string s)
{
if (s.EndsWith(ext))
{
return StripExt(s).GetHashCode();
}
else
{
return s.GetHashCode();
}
}
}
using System;
using System.Linq;
var files1 = new string[] { "1", "2", "3" };
var files2 = new string[] { "1_ext", "2_exp8", "3_exp8" };
var a = files1.Intersect(files2, new FileComparer());
var res = string.Join(", ", a);
Console.WriteLine(res);