C# Split string using regex expression

Question

Input: String input = "{True,True,False},{False,True,True},{False,True,True}"

Expected output: String[] output = new String[]("True,True,False", "False,True,True", "False,True,True");

I am trying to use Regex.Split, but unsuccessful with the pattern. Any hints?

what is data type of input? is it a string or Boolean nested array? — Prasad Telkikar
– Prasad Telkikar, Commented Oct 21, 2019 at 5:55
"expected output: array with elements" what does this mean exactly — TheGeneral
– TheGeneral, Commented Oct 21, 2019 at 5:56
It would be more helpful if you actually initialized variables in code to describe the input and output. — littlerufe
– littlerufe, Commented Oct 21, 2019 at 5:56

tmaj · Accepted Answer · 2019-10-21 10:05:25Z

4

Here is my version:

using System;
using System.Linq;
using System.Text.RegularExpressions;

class Program
{
    public static void Main(string[] args)
    {
        String input = "{True,True,False},{False,True,True},{False,True,True}";

        var pattern = "{(.*?)}";
        var matches = Regex.Matches(input, pattern);

        var output2 = matches
                 .Select(m => m.Groups[1].ToString())
                 .ToList();

        foreach (var o in output2) Console.WriteLine(o);
    }
}

Output

True,True,False
False,True,True
False,True,True

edited Oct 21, 2019 at 10:05

answered Oct 21, 2019 at 6:18

tmaj

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4 Comments

FaisalM Over a year ago

I get the

error CS1061: 'MatchCollection' does not contain a definition for 'Select' and no accessible extension method 'Select' accepting a first argument of type 'MatchCollection' could be found (are you missing a using directive or an assembly reference?)

tmaj Over a year ago

You need using System.Linq. (Updated the answer)

FaisalM Over a year ago

I already added that(and reference to System.Xml.Linq), but still getting the error.

tmaj Over a year ago

I've added the whole program source code to help you with the error.

Michał Turczyn · Accepted Answer · 2019-10-21 06:10:29Z

3

You could try:

var result = input
  // Remove sorrounding { and }     
  .Trim(new char[] { '{', '}' })
  // Split by "},{"
  .Split(new string[] { "},{" }, StringSplitOptions.RemoveEmptyEntries);

answered Oct 21, 2019 at 6:10

Michał Turczyn

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Comments

Prasad Telkikar · Accepted Answer · 2019-10-21 06:12:10Z

0

You can trim first and last { } using .TrimStart() and .TrimEnd() respectively and then apply RegEx with below pattern

    string str = "{True,True,False},{False,True,True},{False,True,True}".TrimStart('{').TrimEnd('}');
    var result = Regex.Split(str, @"},{"); // result is an array of string.
    Console.WriteLine(string.Join(" ", result));

Output

True,True,False False,True,True False,True,True

.Net Fiddle

answered Oct 21, 2019 at 6:12

Prasad Telkikar

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Comments

ABlue · Accepted Answer · 2019-10-21 06:38:46Z

0

You can use:

string input = "{True,True,False},{False,True,True},{False,True,True}";

var pattern = @"{([A-Za-z,].+?)}";
var yourArray = Regex.Matches(input, pattern);

var Result= yourArray 
         .Select(m => m.Groups[1].ToString())
         .ToList();

foreach(var r in Result) {
   Console.WriteLine(r);
}

Your output :

True,True,False
False,True,True
False,True,True

answered Oct 21, 2019 at 6:38

ABlue

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