how to construct specific mercurial ignore patterns?

I would like to ignore all files that start with:

._
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How would I write this in the .hgignore file?

$ cat .hgignore
syntax: glob
._*

Which I have tested thusly (with some "noise" like .. removed for clarity):

$ ls -aRF
.:
a  ._a   .hgignore  sub/

./sub:
a  ._a
$ hg stat
? .hgignore
? a
? sub/a