How to remove specific (unicode) characters in a String using C# and VB.NET

September 25, 2015

Here is an example on how to remove specific (unicode) characters in a String using C# and VB.NET

Samples

C# Sample

static void Main(string[] args)
        {
            Console.OutputEncoding = System.Text.Encoding.Unicode;
            const string unicodeText = @" Ё Ђ Ѓ п р с т у ф х ц ч ";
            const string pattern = @"\u0444";
            const string patternMulti = @"\u0444|\u0401"; 
            string result = String.Empty;

            Console.WriteLine("### SINGLE REPLACE ####");
            result = Regex.Replace(unicodeText, pattern, "HELLO", RegexOptions.Compiled);
            Console.WriteLine(string.Format("Text before: {0}",unicodeText));
            Console.WriteLine(string.Format("Text after: {0}", result));
            Console.WriteLine("### MULTI REPLACE ####");
            result = Regex.Replace(unicodeText, patternMulti, "HELLO", RegexOptions.Compiled);
            Console.WriteLine(string.Format("Text before: {0}", unicodeText));
            Console.WriteLine(string.Format("Text after: {0}", result));
            
            Console.Read();
        }

static void Main(string[] args)

{

Console.OutputEncoding = System.Text.Encoding.Unicode;

const string unicodeText = @" Ё Ђ Ѓ п р с т у ф х ц ч ";

const string pattern = @"\u0444";

const string patternMulti = @"\u0444|\u0401";

string result = String.Empty;

Console.WriteLine("### SINGLE REPLACE ####");

result = Regex.Replace(unicodeText, pattern, "HELLO", RegexOptions.Compiled);

Console.WriteLine(string.Format("Text before: {0}",unicodeText));

Console.WriteLine(string.Format("Text after: {0}", result));

Console.WriteLine("### MULTI REPLACE ####");

result = Regex.Replace(unicodeText, patternMulti, "HELLO", RegexOptions.Compiled);

Console.WriteLine(string.Format("Text before: {0}", unicodeText));

Console.WriteLine(string.Format("Text after: {0}", result));

Console.Read();

}

VB.NET Sample

Sub Main(args As String())
             Console.OutputEncoding = System.Text.Encoding.Unicode
             Const  unicodeText As String = " Ё Ђ Ѓ п р с т у ф х ц ч "
             Const  pattern As String = "\u0444"
             Const  patternMulti As String = "\u0444|\u0401"
             Dim result As String = [String].Empty

             Console.WriteLine("### SINGLE REPLACE ####")
             result = Regex.Replace(unicodeText, pattern, "HELLO", RegexOptions.Compiled)
             Console.WriteLine(String.Format("Text before: {0}", unicodeText))
             Console.WriteLine(String.Format("Text after: {0}", result))
             Console.WriteLine("### MULTI REPLACE ####")
             result = Regex.Replace(unicodeText, patternMulti, "HELLO", RegexOptions.Compiled)
             Console.WriteLine(String.Format("Text before: {0}", unicodeText))
             Console.WriteLine(String.Format("Text after: {0}", result))

             Console.Read()
       End Sub

Sub Main(args As String())

Console.OutputEncoding = System.Text.Encoding.Unicode

Const unicodeText As String = " Ё Ђ Ѓ п р с т у ф х ц ч "

Const pattern As String = "\u0444"

Const patternMulti As String = "\u0444|\u0401"

Dim result As String = [String].Empty

Console.WriteLine("### SINGLE REPLACE ####")

result = Regex.Replace(unicodeText, pattern, "HELLO", RegexOptions.Compiled)

Console.WriteLine(String.Format("Text before: {0}", unicodeText))

Console.WriteLine(String.Format("Text after: {0}", result))

Console.WriteLine("### MULTI REPLACE ####")

result = Regex.Replace(unicodeText, patternMulti, "HELLO", RegexOptions.Compiled)

Console.WriteLine(String.Format("Text before: {0}", unicodeText))

Console.WriteLine(String.Format("Text after: {0}", result))

Console.Read()

End Sub

Result

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Related links:

Regex.Replace Method

How to match strings using wildcards in C# and VB.NET

Administrator

June 17, 2015

0 Comments

To match strings using wildcards in C# and VB.NET you can use the following snippet.
It will internally convert the wildcard string to a Regex.

The Console-Output of this sample will be:

C:\Test\myFile01.xml
C:\Test\myFile02.xml

Sample C#

#region

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

#endregion

namespace de.fesslersoft.RegexWildCard
{
    internal class Program
    {
        private static void Main(string[] args)
        {
            var fileList = new List<String>();
            fileList.Add(@"C:\Test\myFile01.xml");
            fileList.Add(@"C:\Test\myFile02.xml");
            fileList.Add(@"C:\Test\myFolder01.xml");
            fileList.Add(@"C:\Test\myFolder02.xml");

            var wildCard = new Wildcard("*File*.xml", RegexOptions.IgnoreCase);
            foreach (var file in fileList.Where(file => wildCard.IsMatch(file)))
            {
                Console.WriteLine(file);
            }
            Console.Read();
        }
    }


    public class Wildcard : Regex
    {
        public Wildcard(string pattern) : base(ToRegex(pattern))
        {
        }

        public Wildcard(string pattern, RegexOptions options) : base(ToRegex(pattern), options)
        {
        }

        public static string ToRegex(string pattern)
        {
            return "^" + Escape(pattern).Replace("\\*", ".*").Replace("\\?", ".") + "$";
        }
    }
}

Sample VB.NET (autoconverted)

#Region ""

Imports System.Collections.Generic
Imports System.Linq
Imports System.Text.RegularExpressions

#End Region

Namespace de.fesslersoft.RegexWildCard
	Friend Class Program
		Private Shared Sub Main(args As String())
			Dim fileList = New List(Of [String])()
			fileList.Add("C:\Test\myFile01.xml")
			fileList.Add("C:\Test\myFile02.xml")
			fileList.Add("C:\Test\myFolder01.xml")
			fileList.Add("C:\Test\myFolder02.xml")

			Dim wildCard = New Wildcard("*File*.xml", RegexOptions.IgnoreCase)
			For Each file As var In fileList.Where(Function(file) wildCard.IsMatch(file))
				Console.WriteLine(file)
			Next
			Console.Read()
		End Sub
	End Class


	Public Class Wildcard
		Inherits Regex
		Public Sub New(pattern As String)
			MyBase.New(ToRegex(pattern))
		End Sub

		Public Sub New(pattern As String, options As RegexOptions)
			MyBase.New(ToRegex(pattern), options)
		End Sub

		Public Shared Function ToRegex(pattern As String) As String
			Return "^" + Escape(pattern).Replace("\*", ".*").Replace("\?", ".") + "$"
		End Function
	End Class
End Namespace

How to match roman numerals using Regex

Administrator

February 12, 2015

4 Comments

To match roman numerals using Regex you can use the following regex.
The First Group should contain the Roman Numeral.

^(?i:(?=[MDCLXVI])((M{0,3})((C[DM])|(D?C{0,3}))?((X[LC])|(L?XX{0,2})|L)?((I[VX])|(V?(II{0,2}))|V)?))$

How to get the VideoID of a youtube video using Regex

Administrator

June 24, 2014

1 Comment

To get the VideoID of a youtube video using Regex you can use the following snippet.

Sample Regex

^(?:http(?:s)?:\/\/)?(?:www\.)?(?:youtu\.be\/|youtube\.[a-zA-Z]{1,3}\/(?:(?:watch)?\?(?:.*&)?v(?:i)?=|(?:embed|v|vi|user)\/))([^\?&\”‘>]+)

This will match the Vl1tVxfFf1A in https://www.youtube.com/watch?v=Vl1tVxfFf1A.

A more complex regex matching more youtube link variants can be found How to get the Youtube VideoId from Url in C# and VB.NET

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regular expressions

How to remove specific (unicode) characters in a String using C# and VB.NET

Samples

C# Sample

VB.NET Sample

Result

How to match strings using wildcards in C# and VB.NET

Sample C#

Sample VB.NET (autoconverted)

How to get the VideoID of a youtube video using Regex

Sample Regex