Find and Replace in Calc: Can I search for two numbers at the same time in the find and replace dialog?
You can. Use regular expressions. For example, to search for the two numbers 123 or 456 the Find expression would be 123|456 and under Other options check Regular expressions.
Ah, you are right - I misinterpreted the question as asking for search in two different cells at once! What was that which I used for thinking at that moment I wonder?