caractere = { 'a'..'z' | 'A'..'Z' | '0'..'9' | "!" | "\"" | "#" | "%" | "&" | "," | "/" | ":" | ";" | "<" | "=" | ">" | "?" | "@" | "^" | "_" | "`" | "{" | " | " | "}" | "~" }
caractere_echape = { "|" | "$" | "(" | ")" | "[" | "]" | "*" | "?" | "." | "-" }
joker = { "." }

er = { erc ~ ("|" ~ erc)* }
erc = { erb+ }
erb = { ere ~ ere_rep? }
ere = _{
    ("(" ~ er ~ ")") |
    lettre |
    joker |
    ("[" ~ ens_lettre ~ "]") |
    ("[" ~ "^" ~ ens_lettre ~ "]")
}
ere_rep = { "*" | "?" | "+" }

ens_lettre = { element_ens_lettre+ }
element_ens_lettre = { (lettre ~ "-" ~ lettre) | lettre }
lettre = _{ caractere | ("\\" ~ caractere_echape) }

file = { SOI ~ er ~ ("\n")* ~ EOI }