currently i use code to check for values that start with certain strings, but problem arouse when i was looking for cells that started with the letter "M". I have multiple instances of the letter "M" with can be followed by other letters. can i find only the one cell that starts with only the letter m followed by no other letters? An Example of two cells would be
MS301445
MP113555
M443229 this one being the one i want.
the numbers change all the time but the format of it does not.

Dim CriteriaC As String 'In this case CriteriaC is equal to "PE"
'some code
If Left(Range("A" & i).Value, 2) = CriteriaC Then
        Range("A" & i & ":D" & i & "").Copy
'some code
End Sub