Regex not work correctly in array

Question

I want to able to search through folders and subfolder names, then if they have a specific pattern on their name, change or remove them from the folder name. I used the below code but folderNameList return {}

string[] dirs = Directory.GetDirectories(myRootPath, "*", SearchOption.AllDirectories);


string findFolderNamePattern = @"((?i)mydomain.com|sitename(?-i))";
string replacement = " ";
Match folderNameList = Regex.Match(dirs.ToString(), findFolderNamePattern);

                foreach (var folder in folderNameList.ToString())
                {
                    folder = Regex.Replace(folder.ToString(), replacement);
                }

Also you can see the regex here

why are you ToStringing dirs? That won't give you what you want. — Daniel A. White
– Daniel A. White, Commented Aug 20, 2018 at 15:34
because it gets an error cannot convert from 'string[]' to 'string' — D.JCode
– D.JCode, Commented Aug 20, 2018 at 15:42
When you use dirs.ToString() as the input to your RegEx you're effectively searching against the string "System.String[]". You probably meant to run the RegEx for each item in the list instead? — Matt Ruwe
– Matt Ruwe, Commented Aug 20, 2018 at 15:42
Even if you could do this, strings are immutable meaning that folder = "whatever" won't change the source list. — DavidG
– DavidG, Commented Aug 20, 2018 at 15:52

Stanislav Dontsov · Accepted Answer · 2018-08-20 15:52:26Z

1

All you need to do is this:

string[] directories = Directory.GetDirectories(myRootPath, "*", SearchOption.AllDirectories);

string findFolderNamePattern = @"((?i)mydomain.com|sitename(?-i))";
string replacement = " ";            

foreach (var directory in directories)
{
    var newFolder = Regex.Replace(directory, findFolderNamePattern, replacement);
}

answered Aug 20, 2018 at 15:52

Stanislav Dontsov

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2 Comments

D.JCode Over a year ago

thanks. it works when I used to debug, it returns folder names. but never change their name at all!

Stanislav Dontsov Over a year ago

@D.JCode What do you mean by "never change their name at all"? in debug what do you see in newFolder after Regex.Replace? The same value as in directory?

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