Question

How to check if a string contains only English letters in VB.NET

Answer 1

Imports System
Imports System.Text.RegularExpressions

Public Class StringContainsOnlyEnglish
    Public Shared Function IsOnlyEnglishLetters(ByVal s As String) As Boolean
        Dim pattern As String = "^[a-zA-Z]+$"
		
        Return Regex.IsMatch(s, pattern)
    End Function

    Public Shared Sub Main()
		Dim s1 As String = "VBNET"
        Console.WriteLine(IsOnlyEnglishLetters(s1))
		
		Dim s2 As String = "VBNETネット"
        Console.WriteLine(IsOnlyEnglishLetters(s2))
    End Sub
End Class


' run:
'
' True
' False
'

 

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