[2005] need help with Regular Expressions

Hi all -
I am trying to validate the creation of new passwords.
I am trying to force users to use at least one digit, lower and uppper case letter.

The code i am using is from a video showing a user using VS2003. However, I am using vs2005 - i'm not sure if this is affecting it.
The code I am using returns an error no matter what I enter into the form (including values that should be OK).
Can you spot any errrors in my regular expression string (or anywhere here, really :D )?

Here is my code:

Code:

---

    Private Sub TextBox1_Validated(ByVal sender As Object, ByVal e As System.EventArgs) Handles TextBox1.Validated
        If Regex.IsMatch(Me.PasswordTextBox.Text, "^(?=.*\d)(?=.*[a-z])(?=.*[A-Z]).{4,20}$") = True Then
            Me.ErrorProvider1.SetError(Me.TextBox1, Nothing)
            MsgBox("Match!!")
        Else
            Me.ErrorProvider1.SetError(Me.TextBox1, "Invalid Password")
            MsgBox("No Match!!")
        End If
    End Sub

---

update: apparently my code works, I redid the whole form and now it is working perfectly. Goodbye 3 hours of my life searching for a solution for nothing :wave: :mad:

not sure if this is what you want but try this code you need a textbox(tb1) and a button(btn1)

VB Code:

Private Sub btn1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn1.Click
        Dim pw As String' the password you want to check
        Dim p As Integer
        Dim digit As Boolean' true if a digit is found in the password
        Dim cap As Boolean' true if a uppercase letter is found in the password
        Dim low As Boolean' true if a lowercase letter is found in the password
 
        pw = tb1.Text' stores tb1 in the string "pw"
 
 
 
        For p = 0 To pw.Length - 1' loop through the string 1 character at a time and see if the character is a number, uppercase or lowercase
 
            If Char.IsDigit(pw, p) Then
                digit = True
            End If
 
            If Char.IsUpper(pw, p) Then
                cap = True
            End If
 
            If Char.IsLower(pw, p) Then
                low = True
            End If
 
        Next p
 
        If digit = True And cap = True And low = True Then' if all 3 requirments are met then
            lbl1.Text = "Password is good!"
        Else : lbl1.Text = "Bad password make sure you used at least 1 digit 1 lowercase letter and 1 uppercase letter in the password"
        End If
 
 
    End Sub

cool, thanks for the code, much appreciated. I'll try it out also (I got my original code to work somehow ;) )