EBNF parse error

[TopIdiot]

I just use the grammar from https://github.com/ggerganov/llama.cpp/blob/master/grammars/README.md

using xgramar==0.1.7, reproduce code

import xgrammar as xgr

grammar_str =  """
char ::= [^"\\\x7F\x00-\x1F] | [\\] (["\\bfnrt] | "u" [0-9a-fA-F]{4})
item ::= "{" space item-name-kv "," space item-age-kv "}" space
item-age ::= ([0-9] | ([1-8] [0-9] | [9] [0-9]) | "1" ([0-4] [0-9] | [5] "0")) space
item-age-kv ::= "\"age\"" space ":" space item-age
item-name ::= "\"" char{1,100} "\"" space
item-name-kv ::= "\"name\"" space ":" space item-name
root ::= "[" space item ("," space item){9,99} "]" space
space ::= | " " | "\n" [ \t]{0,20}
"""

print(xgr.Grammar.from_ebnf(grammar_str))

got
RuntimeError: [07:57:35] /workspace/cpp/grammar_parser.cc:72: EBNF parse error at line 2, column 13: Invalid escape sequence

[Ubospica]

Thanks for the catch @TopIdiot. The issue here is the repetition {l, r} is not supported well by xgrammar. We are working to fix this issue.