Regular Expression:
^[789]\d{9}$
Validating Phone Number Code:
Imports System.Text.RegularExpressions
Public Class Form1
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Dim regex As Regex = New Regex("^[789]\d{9}$")
Dim isValid As Boolean = regex.IsMatch(TextBox1.Text)
If isValid Then
ErrorProvider1.SetError(TextBox1, "Valid")
Else
ErrorProvider1.SetError(TextBox1, "InValid")
End If
End Sub
End Class
Ouput:
^[789]\d{9}$
^ #Match the beginning of the string
[789] #Match a 7, 8 or 9
\d #Match a digit (0-9 and anything else that is a "digit" in the regex engine)
{9} #Repeat the previous "\d" 9 times (9 digits)
$ #Match the end of the stringValidating Phone Number Code:
Imports System.Text.RegularExpressions
Public Class Form1
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Dim regex As Regex = New Regex("^[789]\d{9}$")
Dim isValid As Boolean = regex.IsMatch(TextBox1.Text)
If isValid Then
ErrorProvider1.SetError(TextBox1, "Valid")
Else
ErrorProvider1.SetError(TextBox1, "InValid")
End If
End Sub
End Class
Ouput:
