get part of string/digits after specific char in C#

Question

i wonder to know how to split specific string from message the user sent the message looks like this

"username: @newbie <----- need to recive the all string with the '@'
password: 1g1d91dk
uid: 961515154 <-- always string of 9 numbers
message: blablabla < ---- changing anytime how can i recive the string after message:"
date: 30/06/18" 
mnumer: 854762158 <-- always string of 9 numbers to but i want to upper one

what exacly i meant is to get the 9 digits after "uid:" ?

thank you very much ! i found a simmilar questions but none of the anwered to my question sorry for the spelling my english is not native

Answer 1

Could you not simply split the string by new line .Split('\n') which will give you a string[] and then in each element split that by ':' and then read the second value? You could store this in a Dictionary<string, string> if you need to reference by the first bit

string inString = @"username: @newbie
password: 1g1d91dk
uid: 961515154
message: blablabla
date: 30/06/18
mnumer: 854762158";

string[] lines = inString.Split('\n');

Dictionary<string, string> data = new Dictionary<string, string>();

foreach (string line in lines)
{
    // There are two ways to avoid splitting multiple : and just using the first
    // Here is my way
    string[] keyValue = line.Split(':');

    data.Add(keyValue[0].Trim(), string.Join(':', keyValue.Skip(1).ToArray()).Trim());

    // Here is another way courtesy of: Dmitry Bychenko
    string[] keyValue = line.Split(new char[] {':'}, 2);

    data.Add(keyValue[0].Trim(), keyValue[1].Trim());
}

This will give you a dictionary where you can access the value of each part of the string by the first part.

Not sure what your usage is but that will help.

You can get the uid by doing data["uid"]

Answer 2

Try using regular expressions:

string source = 
@"username: @newbie <----- need to recive the all string with the '@'
password: 1g1d91dk
uid: 961515154 <-- always string of 9 numbers
message: blablabla < ---- changing anytime how can i recive the string after message:"
date: 30/06/18" 
mnumer: 854762158 <-- always string of 9 numbers to but i want to upper one";


string result = Regex.Match(source, @"(?<=uid:\s*)[0-9]{9}").Value;

In case uid: should start the line

string result = Regex.Match(
   source, 
 @"(?<=^uid:\s*)[0-9]{9}", 
   RegexOptions.Multiline).Value;

Answer 3

You can use regular expressions to match a pattern in a text value, and get the desired values. For example, try this :

var regex = new Regex(@"^(uid:\s)([0-9]+)");
var match = regex.Match("uid: 961515154");
Console.WriteLine(match.Groups[1].Value); // you should get : 961515154

Answer 4

A similar approach to @ZachRossClyne:

void Main()
{
    var data = @"username: @newbie
                password: 1g1d91dk
                uid: 961515154
                message: blablabla
                date: 30 / 06 / 18
                mnumer: 854762158";

    var regex = new Regex(@"^\s*(?<key>[^\:]+)\:\s*(?<value>.+)$");
    var dic = data
        .AsLines()
        .Select(line => regex.Match(line))
        .Where(m => m.Success)
        .Select(m => new { key = m.Groups["key"].Value, value = m.Groups["value"].Value })
        .ToDictionary(x => x.key, x => x.value);
    Console.WriteLine(dic["uid"]);
}

public static class StringEx
{
    public static IEnumerable<string> AsLines(this string input)
    {
        string line;
        using(StringReader sr = new StringReader(input))
        while ((line = sr.ReadLine()) != null)
        {
            yield return line;
        }

    }
}