Question

How to extract only special characters from a string in VB.NET

Answer 1

Imports System.Text.RegularExpressions

Public Class Test
    Public Shared Function extract_special_characters(s as String) As String 
        Dim len As Integer = s.Length
 
        Dim regx As Regex = new Regex("[a-zA-Z0-9]")

        Dim pecial_characters As String = ""

        For i As Integer = 0 To len - 1
            Dim ch As Char = s(i)
            If NOT regx.IsMatch(ch.ToString()) Then
                pecial_characters = pecial_characters + ch
            End If
        Next
        return pecial_characters
    End Function 
    
    Public Shared Sub Main()
        Dim s As String = "c++$vb.net &%java*() php c# <>/python 3.7.3"
         
        Console.WriteLine(extract_special_characters(s))
    End Sub
End Class


' run:
' 
' ++$. &%*()  # <>/ ..
'

 

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