Remove the part of a string that exists in an array of strings

Question

I have a string pathname and an array of strings containing country extensions.

string url = "/pl/test-page/index.html";
string[] countryExtensions = {"/pl/", "/de/", "/tr/"};

What I want to achive is removing that part (/pl/ in the example) if exists in the given array.

if exists I simply want to receive the following url without repeating;

string newUrl = "/test-page/index.html";

Using that new url I want to print out some metacode only once just like below. I tried to use foreach but it then repeats the same metacode.

<link rel="alternate" hreflang="en-US" href="https://example.com/test-page/index.html" />
<link rel="alternate" hreflang="pl-PL" href="https://example.com/pl/test-page/index.html" />
<link rel="alternate" hreflang="de-DE" href="https://example.com/de/test-page/index.html" />
<link rel="alternate" hreflang="tr-TR" href="https://example.com/tr/test-page/index.html" />

How can I achieve that?

string newUrl = "/test-page/index.html"; Why is the / at the start still there? Wasn't it removed when you removed /pl/? — mjwills
– mjwills, Commented Jul 22, 2020 at 14:35
could you please post your foreach attempt? I really would like to see why it did not work. Do you have your urls in a separate collection? — Mong Zhu
– Mong Zhu, Commented Jul 22, 2020 at 14:37
@CaiusJard You're right, I needed to do this: Array.ForEach(countryExtensions, x => { url = url.Replace(x, ""); }); or you could set the countryExtensions.ToList().ForEach(x => { url = url.Replace(x, ""); }); Thank you for correcting me on that. — Ryan Wilson
– Ryan Wilson, Commented Jul 22, 2020 at 14:54

Caius Jard · Accepted Answer · 2020-07-22 14:55:43Z

1

This gives you what you've asked for, but it seems a bit odd if it's what you want:

        string url = "/pl/test-page/index.html";
        string[] ext = {"/pl/", "/de/", "/tr/"};

        //remove the /pl/ and replace with /
        url = url.Replace(ext.FirstOrDefault(x => url.StartsWith(x)) ?? "/", "/");

        //build a list of urls /test.., /pl/test.., /de/test.. and /tr/test..
        var urls = new[] { url }.Concat(ext.Select(x => x.TrimEnd('/') + url));

You can use the urls to build your HTML (I didn't prefix the "https://example.com")

answered Jul 22, 2020 at 14:55

Caius Jard

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