Currently there seems to be no way to "drop" or remove lines if no match is found, even if you have asked to "Match Whole Word Only". I think it would be useful to have the option to completely remove entire rows if it contains what is essentially an invalid entry.
For example:
Rows 4, 5 and 6 do not conform to the correct format that I want to find and replace. They are invalid. With Find replace as is, the output would include the invalid rows. It would be much easier if FR had two outputs, one of which includes the invalid rows, if given the config option to drop any fields that did not match the reference table.