Question

How to check if a string contains only letters, numbers, underscores and dashes in VB.NET

Answer 1

Imports System
Imports System.Text.RegularExpressions

Class RegexValidation
    Public Shared Function IsValidString(ByVal s As String) As Boolean
        Dim pattern As String = "^[A-Za-z0-9_-]*$"
		
        Return Regex.IsMatch(s, pattern)
    End Function

    Public Shared Sub Main()
        Dim s1 As String = "-abc_123-"
        Console.WriteLine(If(IsValidString(s1), "yes", "no"))
			
        Dim s2 As String = "-abc_123-(!)"
        Console.WriteLine(If(IsValidString(s2), "yes", "no"))
    End Sub
End Class


 
' run
'
' yes
' no
'

 

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