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### vba filter hex digits from string excel

By Excel Hero on Feb 21, 2021
``````'Extremely fast function to parse hexidecimal digits from text string:

Function ForceStringToHexDigitsOnly\$(s\$)
Dim i&, p&, max&, t&
Dim b() As Byte, res() As Byte
Static keep() As Boolean

Const VALS\$ = "0123456789 ABCDEFabcdef"

If (Not Not keep) = 0 Then
ReDim keep(0 To 255)
For i = 1 To Len(VALS)
keep(Asc(Mid\$(VALS, i, 1))) = 1
Next
End If

max = Len(s)
ReDim res(0 To max)
b = StrConv(s, vbFromUnicode)
For i = 0 To Len(s) - 1
t = b(i)
If keep(t) Then
res(p) = t
p = p + 1
End If
Next
ForceStringToHexDigitsOnly = Left\$(StrConv(res, vbUnicode), p)
End Function

'------------------------------------------------------------------------------

MsgBox ForceStringToHexDigitsOnly("qA01mzBoo7o2F%F")  '<--displays: A01B72FF

'
'
'
``````