Cross reference .contains?

[CoBHC]

How can I cross reference a .contains for two textboxes? like

for each word in textbox1.text
if textbox2.text.contains(word) then
msgbox("There was a word found that should not be there",msgboxstyle.critical,"Invalid")
end if
next

Would I need to do a RegEx to get every word in the textobox? Or should i just use a listbox and do a for each I as item in listbox1.items?
Please bless this mess!