Extract multiple values from string using C#

Question

I'am creating my own forum. I've got problem with quoting messages. I know how to add quoting message into text box, but i cannot figure out how to extract values from string after post. In text box i've got something like this:

[quote IdPost=8] Some quoting text [/quote]

[quote IdPost=15] Second quoting text [/quote]

Could You tell what is the easiest way to extract all "IdPost" numbers from string after posting form ?.

Do you want the number on [quote] or the string between [quote][/quote] ? — aloisdg
– aloisdg, Commented Dec 16, 2014 at 22:24

Steve · Accepted Answer · 2014-12-16 22:28:23Z

5

by using a regex

@"\[quote IdPost=(\d+)\]"

something like

Regex reg = new Regex(@"\[quote IdPost=(\d+)\]");
foreach (Match match in reg.Matches(text))
{
   ...
}

edited Dec 16, 2014 at 22:28

answered Dec 16, 2014 at 22:22

Steve

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4 Comments

David Over a year ago

Note that since MatchCollection only implements IEnumerable, match will be an object unless you add .OfType<Match>()

Steve Over a year ago

@Aravol good catch, guess I cant just be lazy and use var LOL

aloisdg Over a year ago

I think using RegEx here is overpower.

Steve Over a year ago

@aloisdg we use whatever is easy and suits the job to do the tasks isn't it ~~

alkasai · Accepted Answer · 2014-12-16 23:19:17Z

0

var originalstring = "[quote IdPost=8] Some quoting text [/quote]";

//"[quote IdPost=" and "8] Some quoting text [/quote]"
var splits = originalstring.Split('=');
if(splits.Count() == 2)
{
    //"8" and "] Some quoting text [/quote]"
    var splits2 = splits[1].Split(']');
    int id;
    if(int.TryParse(splits2[0], out id))
    {
        return id;
    }
}

answered Dec 16, 2014 at 23:19

alkasai

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Comments

aloisdg · Accepted Answer · 2014-12-16 23:48:25Z

I do not know exactly what is your string, but here is a regex-free solution with Substring :

using System;

public class Program
{
    public static void Main()
    {
        string source = "[quote IdPost=8] Some quoting text [/quote]";

        Console.WriteLine(ExtractNum(source, "=", "]"));
        Console.WriteLine(ExtractNum2(source, "[quote IdPost="));
    }

    public static string ExtractNum(string source, string start, string end)
    {
        int index = source.IndexOf(start) + start.Length;
        return source.Substring(index, source.IndexOf(end) - index);
    }

    // just another solution for fun
    public static string ExtractNum2(string source, string junk)
    {
        source = source.Substring(junk.Length, source.Length - junk.Length); // erase start
        return source.Remove(source.IndexOf(']')); // erase end
    }
}

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