Tags/Tag from Filename not working

[hubbstubb]

Mac OS 10.10.5

Tagger 1.8.0.7

I've tried a few different ways to get Tagger to copy the filename to the title tag, but nothing seems to work. I'm not entirely sure I'm doing the process correctly.

I select the files to be changed. I go to the Tags menu, then select Tags from Filenames, then choose 01 Title and nothing happens.

I also tried Tags/Tags from Filenames/Using Custom Format. What to do with that window isn't clear. I clicked on "title" then click the tag button. Then I get this error.

Error Matching failed for Regex: