Extract maximum number from a string

Question

I am trying to extract all numbers from a string with a function in Excel. In the second time, I would like to extract the maximum value contains in the string.

Answer 1

Collect all of the mixed numbers as doubles in an array and return the maximum value.

Option Explicit
Option Base 0    '<~~this is the default but I've included it because it has to be 0

Function maxNums(str As String)
    Dim n As Long, nums() As Variant
    Static rgx As Object, cmat As Object

    'with rgx as static, it only has to be created once; beneficial when filling a long column with this UDF
    If rgx Is Nothing Then
        Set rgx = CreateObject("VBScript.RegExp")
    End If
    maxNums = vbNullString

    With rgx
        .Global = True
        .MultiLine = False
        .Pattern = "\d*\.\d*"
        If .Test(str) Then
            Set cmat = .Execute(str)
            'resize the nums array to accept the matches
            ReDim nums(cmat.Count - 1)
            'populate the nums array with the matches
            For n = LBound(nums) To UBound(nums)
                nums(n) = CDbl(cmat.Item(n))
            Next n
            'test array
            'Debug.Print Join(nums, ", ")
            'return the maximum value found
            maxNums = Application.Max(nums)
        End If
    End With
End Function