Fix Consecutive Hyphens (--) Allowed in Braille Input

[Beeram12]

Fixes #6

Changes made

1. Changed the regex from

^(?:1?2?3?4?5?6?)(?:-(?:1?2?3?4?5?6?))*$

to

^[1-6]+(?:-[1-6]+)*$

Explanation:
In my regex intially it checks only if numbers are from 1-6 and then hyphen - used to seperate again numbers from 1-6 and it goes on

I am happy to do if any changes are needed after review.

[jriyyya]

Even though your implementation successfully prevents a hyphen at the start and disallows multiple consecutive hyphens, it fails to enforce other crucial validation rules. The one I noticed were:

• Numbers must be in sequential order (e.g., 2 cannot appear before 1, 3 cannot appear before 2, etc.).
• Duplicate numbers are not allowed (e.g., 111 is invalid in Braille).
• Valid Braille numbers are strictly limited to: 1, 12, 123, 1234, 12345, 123456, 2, 23, 234, etc.

[Beeram12]

Thank you for your feedback.I improved the regex from before so that it could pass all the checks as mentioned although the regex is quite nested.Its working and I have tested it with some examples.If anything needed to be changed please let me know.

[Beeram12]

@jriyyya
I hope anyone reviews this and be active in this community may I know any official channel where discussion related to GSOC is happening and also how to increase chance of slection.