Find contained string in a string and get it's ending index value

I'm trying to store unknown amount of specific strings inside a string but I want to get it's index so I can check it again. For example:

List<string> values = new List<string>();
int num;
string line = "/hello/1 /a/sdhdkd asjs /hello/2 ajhsd asjskjd skj /hello/s sajdk /hello/3 assdsfd hello/4";

And I want to store: /hello/1, /hello/2, /hello/3 and /hello/4 but NOT hello/s because it's different pattern (Not number) in a string List but I don't know how...

What I think is this:

//detect a common pattern between them

if(line.Contains("/hello/")

How can I know which is the position of the last "/" found in "/hello/" (In line it would be line[6]) so I can do this: if(int.TryParse(line[7], num))

if this TryParse returns true, it would store values.Add("/hello/"+line[7]); The value after "/" won't be higher than 9 or negative (Example: /hello/34 or /hello/-23)

And then an auxiliar string would be what is AFTER this:

string aux = "";
for(int i=index_value; i<line.Length; i++) aux+= line[i]; //Where index_value would be 7+1
line = aux;

So now, line is: 

" /a/sdhdkd asjs /hello/2 ajhsd asjskjd skj /hello/s sajdk /hello/3 assdsfd hello/4";

and I will make the search again, but what I am missing is how to get that index value so next time I make this search, my line would be:

" ajhsd asjskjd skj /hello/s sajdk /hello/3 assdsfd hello/4";

after finding and saving "/hello/2"

Jon Skeet
people
quotationmark

This looks like a good place to use regular expressions (and that's not something I say often). For example:

using System;
using System.Text.RegularExpressions;

class Program
{
    static void Main(string[] args)
    {
        var regex = new Regex(@"/hello/\d+\b");
        var text = "/hello/1 /a/sdhdkd asjs /hello/2 ajhsd " 
            + "asjskjd skj /hello/s sajdk /hello/3 assdsfd hello/4";

        foreach (Match match in regex.Matches(text))
        {
            Console.WriteLine("{0} at {1}", match.Value, match.Index);
        }
    }
}

Output:

/hello/1 at 0
/hello/2 at 24
/hello/3 at 66

(No hello/4, because it doesn't have a leading slash.)

If the hello shouldn't be hardcoded, you could use new Regex(@"/\w+/\d+\b") or something similar to allow all word characters in the slug.

people

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