PEST JSON Path grammar

path = _{ SOI ~ base ~ accessor* ~ EOI }

base = @{ ("$" | "_" | ASCII_ALPHA) ~ identifier }

accessor = _{ ("." ~ identifier ) | ("[\"" ~ inner ~ "\"]") | index }
identifier = { ("$" | "_" | ASCII_ALPHANUMERIC)* }

inner = @{ char* }
char = {
    !("\"" | "\\") ~ ANY
    | "\\" ~ ("\"" | "\\" | "/" | "b" | "f" | "n" | "r" | "t")
    | "\\" ~ ("u" ~ ASCII_HEX_DIGIT{4})
}

number = { ASCII_DIGIT+ }
index = _{ "[" ~ number ~ "]" }