# Extract letters from a string contaning numbers

i have a regristraction routine that check for valid input
I thought the following would work, but if the user only entered numbers and no letters
it could be fooled, how can i make sure the proper letters are input ?

``````Private Sub Command5_Click()
Dim Success As Boolean
Dim Value As String
Dim StringEntered As String
StringEntered = "yjk65kg12dky" 'this will be textbox value entered by user
Value = GetNumbers(StringEntered)

If Val(Value) >= 5000 And Val(Value) <= 9900 Then
'now check if the correct letters are typed
Success = True
Else
Success = False
End If
MsgBox Success

End Sub
Function GetNumbers(Value As String) As String
'extract and return numbers from a string
Dim Index As Long
Dim Digit As String
Dim Final As String
Dim Count As Long

Count = 1
GetNumbers = space(Len(Value))
For Index = 1 To Len(Value)
Digit = Mid(Value, Index, 1)
If Digit Like "[0-9]" Then
Mid(GetNumbers, Count, 1) = Digit
Count = Count + 1
End If
Next

GetNumbers = Left(GetNumbers, Count - 1)
End Function
``````
###### Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Older than dirtCommented:
This will result in just the letters in Final. If you just want numbers then remove the Not.

``````      For Index = 1 To Len(Value)
If Not IsNumeric(Mid\$(Value, Index, 1)) Then
Count = Count + 1
Final = Final & Mid\$(Value, Index, 1)
End If
Next
``````
0
Older than dirtCommented:
I'm sorry but I see I most likely misunderstood your requirement.

What things would make the input invalid?
0
Author Commented:
Thanks martin liss
If the user only typed numbers and no letters it could be valid or

StringEntered = "yjk65kg12dky" 'this will be textbox value entered by user
the output would also need the letters "yjkkgdky" and the number value  5000 to 9900
0
Older than dirtCommented:
``````Dim Index As Long

Dim Digit As String
Dim strLetters As String
Dim strNumbers As String
Dim Count As Long

For Index = 1 To Len(TextBox1.Text)
If IsNumeric(Mid\$(TextBox1.Text, Index, 1)) Then
'Count = Count + 1 What do you want to count?
strNumbers = strNumbers & Mid\$(TextBox1.Text, Index, 1)
Else
strLetters = strLetters & Mid\$(TextBox1.Text, Index, 1)
End If
Next

MsgBox strNumbers
MsgBox strLetters
``````
0

Experts Exchange Solution brought to you by

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Older than dirtCommented:
Or perhaps something like this.

``````    Const Valid = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"

For Index = 1 To Len(TextBox1.Text)
If InStr(1, Mid\$(TextBox1.Text, Index, 1), Valid) = 0 Then
MsgBox "Invalid character '" & Mid\$(TextBox1.Text, Index, 1) & "' found"
Exit Sub
End If
Next
``````
0
Author Commented:
Thanks MartinLiss
Function GetLetters(value As String)
Dim Index As Long
Dim Count As Long
Dim Final As String
For Index = 1 To Len(value)
If Not IsNumeric(Mid\$(value, Index, 1)) Then
Count = Count + 1
Final = Final & Mid\$(value, Index, 1)
End If
Next
GetLetters = Final

End Function
and checked it against "yjkkgdky"
0
Older than dirtCommented:
0
Author Commented:
No your last post allows any numbers or letters.
I need to restrict the input to values  to be between 5000 to 9900 and must contain
the letters: "yjkkgdky"
0
Older than dirtCommented:
Ok then I'm glad I was able to help.

In my profile you'll find links to some articles I've written that may interest you.
Marty - MVP 2009 to 2014
0
Author Commented:
What does this mean  "yjk#k@gdky"
Hope you can answer my next question i am going to post. its regarding this same routine
0
Older than dirtCommented:
I assumed that someone was entering a value containing characters like "@", "#", "\$", etc in a textbox and if so your code in post ID: 40220525 would treat those as non-numeric.
0
Author Commented:
thats ok if  "@", "#", "\$" it would be invalid mean nothing
The input must contain "yjkkgdky" and the value between 5000 and 9900
0
###### It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Visual Basic Classic

From novice to tech pro — start learning today.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.