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c#stringsplit
Zaki
Zaki

Reputation: 5600

c# get first instance of string

I have a string with carriage returns in it I separate them using the following split:

 string[] RemoveEmptySpace = result.Split(new string[] { "\n", "\r\n" }, StringSplitOptions.RemoveEmptyEntries);

so it becomes like this:

Server:  xxx
Address:  xxx.xxx.11.10

Non-authoritative answer:
Name:    test.com
Address:  xxx.xxx.888.555

now my question is how do i get the first instance of Address numbers only not the text e.g.'xxx.xxx.11.10'? the string comes from nslookup so it is dynamic the position may change...

Thanks

Upvotes: 1

Views: 2068

Answers (7)

ANeves
ANeves

Reputation: 6365

Alternatively to the split approach, you can use a regular expression:

Regex addrParser = new Regex(@"Address:\s+([\d\.]+)", RegexOptions.Multiline);
string address = null;
if (addrParser.IsMatch(result)) {
    address = addrParser.Match(result).Groups[1].Value;
}

This works as intended:

r = new Regex(@"Address:\s+([\d\.]+)", RegexOptions.Multiline);  
r.IsMatch("Address:   123.456.888.555"); // true

It is useful to look into a cheat sheet: http://www.mikesdotnetting.com/Article/46/CSharp-Regular-Expressions-Cheat-Sheet

Upvotes: 0

Aaron J Spetner
Aaron J Spetner

Reputation: 2155

Use this function:

static String getAddress(String[] Haystack)
{
    foreach(String line in Haystack)
    {
        if(line.Substring(0, 8) == "Address:")
            return line.Substring(10);
    }
    return "";
}

You can call it like this:

getAddress(RemoveEmptySpace)

Upvotes: 0

Samuel Slade
Samuel Slade

Reputation: 8613

You could iterate over the collection of strings you got from the split, and parse those beginning with "Address". i.e. something like this:

string[] RemoveEmptySpace = ...;

// ...
foreach (string line in RemoveEmptySpace)
{
    if (line.StartsWith("Address:"))
    {
        string[] segments = line.Split(new char[1] { ':' }, StringSplitOptions.RemoveEmptyEntries);

        // Use the second segment, as this should be the value
        string value = segments[1].Trim();

        // Note: You now have the string representation of the Address numbers.

        // Stop searching for more addresses
        break;
    }
}

Upvotes: 1

adelphus
adelphus

Reputation: 10326

Regular expressions are your friend. Assuming your result always contains the phrase "Address: nnn.nnn.nnn.nnn", you can simply do:

Match m = Regex.Match(result, "Address\\:\\s*(\\d+(\\.\\d+)+)");
if (m.Success) {
   string address = m.Groups[1];    // m.Groups[1] returns the dotted address part
}

You could perform a match for each element in your array, but it's probably easier just to use the result string.

Upvotes: 2

Cristian Lupascu
Cristian Lupascu

Reputation: 40536

After you do the split, do this:

var firstAddress =
    (from line in RemoveEmptySpace 
    let split = line.Split(new[] { ':' })
    where split[0] == "Address"
    select split[1]).First();

(you may need to add using System.Linq; at the beginning of the file for this to work)

Upvotes: 1

Pranay Rana
Pranay Rana

Reputation: 176896

Just break the string in two parts (i.e., apply the Split(...) function again on the created strings).

string[] add= arrayStr[1].Split(':');
Console.WriteLine("address" + add[1]); // TODO: verify syntax

Upvotes: 2

Azodious
Azodious

Reputation: 13872

Iterate over the array RemoveEmptySpace

Check, if the string at current index, StartsWith 'Address:'

if yes, split it with : and fetch value at index [1]

break the iteration.

Upvotes: 0

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