Question

How to check if string contain lowercase letters, uppercase letters, or digits in VB.NET

Answer 1

Imports System.Text.RegularExpressions

Module Module1

    Sub Main()

        Dim s1 As String = "VBNET13Java89Python"
        Console.WriteLine(Regex.IsMatch(s1, "^[a-zA-Z0-9]*$"))

        Dim s2 As String = "!**!***!"
        Console.WriteLine(Regex.IsMatch(s2, "^[a-zA-Z0-9]*$"))

        Dim s3 As String = "VB 13 Java 89 Python"
        Console.WriteLine(Regex.IsMatch(s3, "^[a-zA-Z0-9]*$"))

        Dim s4 As String = "VBJavaPython"
        Console.WriteLine(Regex.IsMatch(s4, "^[a-zA-Z0-9]*$"))

        Dim s5 As String = "12345"
        Console.WriteLine(Regex.IsMatch(s5, "^[a-zA-Z0-9]*$"))

    End Sub

End Module


' run:
' 
' True
' False
' False
' True
' True

 

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