Tesseract OCR ignoring "-"

Question

In my application, i am reading text from an image that contains numbers and alphabets separated with -

For example 1-TT88TY5-AD5G

However, Tesseract is ignoring - and giving me 1TT88TY5AD5G..

How to force it to read hyphens too..

Here's my initial code for it..

Tesseract* tesseract = [[Tesseract alloc] initWithDataPath:@"tessdata" language:@"eng"];
                       [tesseract setVariableValue:@"0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ" forKey:@"tessedit_char_whitelist"];

Answer 1

I'm pretty much guessing here since I haven't used Tesseract, but shouldn't the - be in the whitelist?

[tesseract setVariableValue:@"-0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ" forKey:@"tessedit_char_whitelist"];
                              ^