Yet another user-pattern post

[Felipe Monobe]

Hey guys,

I gotta read BR car plates with the following pattern: 3 upper-case letters, 1 dash, 4 numbers.
I've tried '\c\c\c-\d\d\d\d', '\A\A\A-\d\d\d\d' and '[A-Z]{3}-\d{4]'. None of these worked.

All I get is:

Error: failed to insert pattern '\A\A\A-\d\d\d\d'

And tesseract reads ignoring the pattern. So a plate like "ORB-3913" outputs "OR6-39T3"... which I pretty much guess it would be solved passing correctly the pattern.
What am I doing wrong?

[Felipe Monobe]

I also recently tried using DAWGs to help out...

- number DAWG:

"-    " (4 blank spaces)

- word DAWG:

"AAA-
AAB-
.
.
."

Obviously without the double-quotes.
With no better results whatsoever.