admin2 said:
isn't it easier to just set an alias instead of doing a mass tag edit?

It is but it's a bit confusing since if you're looking at the alias in the post or at the alias. Lets use Aoi_Nanase for the example.

Aoi_Nanase gets 133 results with Nanase_Aoi gets 33. With the alias inplace you should be able to see both versions, correct?