\x{2190}\x{21D2}#]&&{{operator_character}}]{{operator_character}}*|
  =[[^>]&&{{operator_character}}]{{operator_character}}*|
  =>{{operator_character}}+|
  <(?!{{operator_character}}|[[:alpha:]])|
  <[[^\-%:]&&{{operator_character}}]+|
  <[:%\-]{{operator_character}}+|
  :[[^<]&&{{operator_character}}]+|
  :<{{operator_character}}+|
  [@\x{2190}\x{21D2}#]{{operator_character}}+
)