Question

How to check if string contain only letters and (or) numbers using regular expression in VB.NET

Answer 1

Imports System
Imports System.Text.RegularExpressions
 
Public Class Test
    Shared Function IsValid(ByRef s As String) As Boolean
        Return Regex.IsMatch(s, "^[a-zA-Z0-9]*$")
    End Function
     
    Public Shared Sub Main()
        Console.WriteLine(IsValid("vbnet123"))
        Console.WriteLine(IsValid("vb.net123"))
        Console.WriteLine(IsValid("vbnet"))
        Console.WriteLine(IsValid("123"))
    End Sub
End Class
 
 
 
' run
' 
' True
' False
' True
' True
'

 

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