message: Fix Hilghlight xltabular as tabular.
diff: (?:\s*) # Optional whitespace
  ((\\)begin) # Marker - Function
  (\{) # Open Bracket
  - (array|tabular[xy*]?)
  + (array|tabular[xy*]?|xltabular)
  (\}) # Close Bracket
  (\s*\n)? # Match to end of line absent of content
  </string>
  