How to check if text is within a string

Hi There,

I couldn't find anywhere on the web for a VBA "ISIN" Operator.

I'd like to have a function whereby its able to tell me if a value is within a string

Example:

Dim x as String
x = "The stop sign is red"

if "sign" isin x then
msgbox "True"
else
msgbox "False"
End If