Remove non numeric characters

The first part of your request can be accomplished by using the following function:

Function EEDemo(varInput As Variant)
    Dim strTemp As String
    With CreateObject("VBScript.RegExp")
        .Pattern = "\D+"
        .Global = True
        strTemp = .Replace(varInput, "")
    End With
    EEDemo = strTemp
End Function

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As far as the second part is concerned, I'm not sure what you mean. Are you only looking to add the area code if it is missing?
If that is the case this function will do the job.

Function EEDemo(varInput As Variant)
    Dim strTemp As String
    With CreateObject("VBScript.RegExp")
        .Pattern = "\D+"
        .Global = True
        strTemp = .Replace(varInput, "")
    End With
    If Len(strTemp) = 7 Then
        EEDemo = Format("123" & strTemp, "###-###-####")
    Else
        EEDemo = strTemp
    End If
End Function

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to remove those characters, you can use the Replace() function in a query

select replace(replace(replace(replace([Phone],"/",""),"(",""),")",""),"-","")
from table

or use a VBA function
place this codes in a regular module

Function GetNumbersOnly(strIn As String)
Dim j, numOnly
If strIn = "" Then Exit Function
For j = 1 To Len(strIn)
    If IsNumeric(mid(strIn, j, 1)) Then
        numOnly = numOnly & mid(strIn, j, 1)
    End If
Next
GetNumbersOnly = numOnly
End Function

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then use the function in your query

select GetNumbersOnly([Phone])
From tablex

I think you need to "walk the string" and pick out the items which are numeric:

Dim i As Integer
Dim res As String
For i=0 to Len(YourString) - 1
  If IsNumeric(Mid(YourString, i, 1)) Then
    res = res & Mid(YourString, i, 1)
  End If
Next i

i= 1
If Len(res) < 10 Then
  Do until Len(res) = 10
    res = Cstr(i) & res
    i = i+1
  Loop
End If

Not sure about the formatting - you generally do that on a Form.

I tried

update GetNumbersOnly([Phone])
From tablex

and it came back with an error in my update statement

what is the name of your table? field name for Phone?

contacts and w_phone

try this, backup table contacts first

update contacts
set w_phone =  GetNumbersOnly([w_Phone])

to add the formatting use this modified function

Function GetNumbersOnly(strIn As String)
Dim j, numOnly
If strIn = "" Then Exit Function
For j = 1 To Len(strIn)
    If IsNumeric(Mid(strIn, j, 1)) Then
        numOnly = numOnly & Mid(strIn, j, 1)
    End If
Next
If Len(numOnly) < 10 Then
GetNumbersOnly = "123-" & Format(numOnly, "###-####")
Else
GetNumbersOnly = Format(numOnly, "###-###-####")
End If
End Function

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tried this and it failed, but worked with 1

update contacts
set w_phone =  GetNumbersOnly([w_Phone]),
set h_phone =  GetNumbersOnly([h_Phone])

this is the correct syntax

update contacts
set w_phone =  GetNumbersOnly([w_Phone]),
h_phone =  GetNumbersOnly([h_Phone])

Ok, thought this was easier to do on my own:

For this part, if the number is < 10 or > 10, just leave it alone. Haha, then that should be it!

If it is 10 exactly, then format

If Len(numOnly) < 10 Then
GetNumbersOnly = "123-" & Format(numOnly, "###-####")
Else
GetNumbersOnly = Format(numOnly, "###-###-####")

here is the code

If Len(numOnly) = 10 Then
GetNumbersOnly = Format(numOnly, "###-###-####")
Else
GetNumbersOnly =numOnly
end if

Last part,

Function GetNumbersOnly(strIn As String)
Dim j, numOnly
If strIn = "" Then Exit Function
For j = 1 To Len(strIn)
    If IsNumeric(Mid(strIn, j, 1)) Then
        numOnly = numOnly & Mid(strIn, j, 1)
    End If

How can I keep the character x?

Sometimes people put their number in and have x for extension.