How to Validate Phone Number (VB.Net)

This tutorial will help you to validate phone number with two format:

• 000-000-000                 -eg: 012-000-999
• 000-000-0000               -eg: 012-000-9999
• (000)00-000-000          -eg: (855)12-000-999
• (000)00-000-0000        -eg: (855)12-000-9999

Application Design

No	Control Type	Name	Text
1	Form1	FormValidate	Validate Phone Number
2	Textbox1	TextBoxPhone
3	Label1	LabelStatus
4	Button1	ButtonValidate	Validate

Code

Imports System.Text.RegularExpressions

Public Class FormValidate

    Private Sub ButtonValidate_Click(sender As Object, e As EventArgs) Handles ButtonValidate.Click

        Dim phoneNumber As New Regex("\d{3}-\d{3}-\d{4}")

        Dim phoneNumber1 As New Regex("\d{3}-\d{3}-\d{3}")

        Dim phoneNumber2 As New Regex("\(\d{3}\)\d{2}-\d{3}-\d{3}")

        Dim phoneNumber3 As New Regex("\(\d{3}\)\d{2}-\d{3}-\d{4}")

        If phoneNumber.IsMatch(TextBoxPhone.Text) Then

            LabelStatus.Text = "The phone number: " & TextBoxPhone.Text & " is validated"

        ElseIf phoneNumber1.IsMatch(TextBoxPhone.Text) Then

            LabelStatus.Text = "The phone number: " & TextBoxPhone.Text & " is validated"

        ElseIf phoneNumber2.IsMatch(TextBoxPhone.Text) Then

            LabelStatus.Text = "The phone number: " & TextBoxPhone.Text & " is validated"

        ElseIf phoneNumber3.IsMatch(TextBoxPhone.Text) Then

            LabelStatus.Text = "The phone number: " & TextBoxPhone.Text & " is validated"

        Else

            LabelStatus.Text = "The phone number: " & TextBoxPhone.Text & " is not validated"

        End If

    End Sub

End Class

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