Question | Remove text from string

I got a string includes text from a .txt file (string s = File.ReadAllText(TextFilePath));

From this string I want to remove all the text that is between the chars "--" and "\r\n".

For example:
Original: "aaaa \r\n -- abcde \r\n aaaa"
New: "aaaa \r\n aaaa"

How can I do it?

Code:

---

int index = s.IndexOf("--");
if( s > 0 )
{
    return s.Substring( 0, index ) + Environment.NewLine;
}
else
{
    return s;
}

---

You could use String's IndexOf method to find -- and \r\n, then use Substr to remove whatever is inbetween them.

I want you to take another look at my example:

what you gave me doesnt answer my problem.

also, what if there is more than one instance of "-- text \r\n"?

Quote:

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Originally Posted by Sarlula

I want you to take another look at my example:

what you gave me doesnt answer my problem.

also, what if there is more than one instance of "-- text \r\n"?

---

1. Yes it does.
2. Well, if there can be multiple instances of '--' then I guess you should have said that and included it in your example, eh?

Look at String.Split and/or regular expressions.

Code:

---

            string Original = "aaaa \r\n -- abcde \r\n aaaa";
            string new_string = Original;

            int start = 0;
            int end = 0;
            int len = 0;

            do{
                start = new_string.IndexOf("--", start);
                if(start == -1)
                    break;

                end = new_string.IndexOf("\r\n", start);
                if(end == -1)
                    break;

                len = end + 2 - start;

                new_string = new_string.Remove(start, len);
            } while (new_string.IndexOf("\r\n", start) > 0);
            MessageBox.Show(new_string);

---

Or

Code:

---

            string Original = "aaaa \r\n -- abcde \r\n aaaa";
            string new_string = Original;

            for (int a = 0; a < Original.Length; )
            {
                if (a >= Original.Length)
                    break;

                if (a + 2 == Original.Length)
                {
                    new_string += Original.Substring(a, 2);
                    break;
                }

                if (Original.Substring(a, 2) == "--" && Original.IndexOf("\r\n", a) > a)
                    a = Original.IndexOf("\r\n", a) + 2;
                else
                    new_string += Original.Substring(a++, 1);
            }

            MessageBox.Show(new_string);

---

I think i prefere the first one.

Regular expressions is probably 10 times easier.