Repetition - Limitation of the current EBNF Grammar Implementation

[TheMrCodes]

The Following functionality of the EBNF Definition from llama.cpp is mission at the moment in the grammar_parser.cc

Definition: https://github.com/ggerganov/llama.cpp/blob/master/grammars/README.md

Section

## Repetition and Optional Symbols
- {m} repeats the precedent symbol or sequence exactly m times
- {m,} repeats the precedent symbol or sequence at least m times
- {m,n} repeats the precedent symbol or sequence at between m and n times (included)
- {0,n} repeats the precedent symbol or sequence at most n times (included)

This issue can be seen as a feature as well as a documentation update request.

Thanks very much to the whole team!
I was looking for a good lightweight grammar implementation for a long time 🙏

[Ubospica]

Yes, we plan to support that in the next version. Thanks for pointing that out!