query.pest

tag = {"#" ~ (LETTER|NUMBER|CONNECTOR_PUNCTUATION|DASH_PUNCTUATION)+}

operation = _{and | or}
  and = {"&"}
  or = {"|"}

unary_not = {"!"}

expr = {term ~ (operation ~ term)*}
  term = _{unary_not* ~ tag | "(" ~ expr ~ ")"}

tagsearch = _{SOI ~ expr ~ EOI}

WHITESPACE = _{" " | "\t" | NEWLINE}