Option Compare Text

If you do not worry about the case in comparisons, then use the Option Compare Text for string comparisons based on a case-insensitive text sort order determined by system's locale
Warning: This cannot be set for procedure level. When set, this will be for the entire module

Sub Option_Compare_Statement_Example()


Dim sStr1 As String ' String 1
Dim sStr2 As String ' String 2

' ---------------------------------------------------------------
' Written By Shanmuga Sundara Raman for http://vbadud.blogspot.com
' ---------------------------------------------------------------

sStr1 = "MixedCase"
sStr2 = "mixedcase"


If InStr(1, sStr1, sStr2) Then
MsgBox "Matching!!!"
End If

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

End Sub