How to improve Number OCR

From a user:

Is it possible to narrow down the recognition to numbers and enhance the correctness?
Numbers I mean something the regular expression -?\d+(?:,\d+)(?:.\d+)?%?* matches, maybe separated by space.

Currently, I have to set the language to English to increase the correctness. And still, I got o/O for 0, l for 1, “… - 1 …” for “… -1 …”, “… 00 …” for “… 0 0 …”, and “… 0123” for “… 0 123” from time to time.

Answer: Use Engine2 for number OCR:

Engine2:

Engine1 (Blue = recognition errors where 0 and o where confused)

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