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
using System.Linq;
using System.Text.RegularExpressions;
namespace de.fesslersoft.YoutubeRegexTest
{
internal static class Youtube
{
private const string YoutubeLinkRegex = "(?:.+?)?(?:\\/v\\/|watch\\/|\\?v=|\\&v=|youtu\\.be\\/|\\/v=|^youtu\\.be\\/)([a-zA-Z0-9_-]{11})+";
internal static string GetVideoId(string input)
{
var regex = new Regex(YoutubeLinkRegex, RegexOptions.Compiled);
foreach (Match match in regex.Matches(input))
{
//Console.WriteLine(match);
foreach (var groupdata in match.Groups.Cast<Group>().Where(groupdata => !groupdata.ToString().StartsWith("http://") && !groupdata.ToString().StartsWith("https://") && !groupdata.ToString().StartsWith("youtu") && !groupdata.ToString().StartsWith("www.")))
{
return groupdata.ToString();
}
}
return string.Empty;
}
}
}
Sample VB.NET
Imports System.Linq
Imports System.Text.RegularExpressions
Namespace de.fesslersoft.YoutubeRegexTest
Friend NotInheritable Class Youtube
Private Sub New()
End Sub
Private Const YoutubeLinkRegex As String = "(?:.+?)?(?:\/v\/|watch\/|\?v=|\&v=|youtu\.be\/|\/v=|^youtu\.be\/)([a-zA-Z0-9_-]{11})+"
Friend Shared Function GetVideoId(input As String) As String
Dim regex = New Regex(YoutubeLinkRegex, RegexOptions.Compiled)
For Each match As Match In regex.Matches(input)
For Each data As Group In match.Groups.Cast(Of Group)().Where(Function(groupdata) Not groupdata.ToString().StartsWith("http://") AndAlso Not groupdata.ToString().StartsWith("https://") AndAlso Not groupdata.ToString().StartsWith("youtu") AndAlso Not groupdata.ToString().StartsWith("www."))
Return data.ToString()
Next
Next
Return String.Empty
End Function
End Class
End Namespace
<System.Runtime.CompilerServices.Extension> _
Public Shared Function IsUppercase(input As String) As Boolean
Return Regex.IsMatch(input, "^[A-Z]+$")
End Function
There are various methods to remove unicode characters from a String in .NET.
Below i will show you some methods and the benchmark results.
Before choosing a method, take a look at the Benchmark result and the Framework Compatibility.
Benchmark Summary
A for Loop removed 100 000 times the unicode characters of the string value ᾭHeὣlݬl♫oѪ₪ Wor♀ld. This has been repeated 40 Times for each method. All Methods returned the right result Hello World.
