formula_peg.txt in rubyfromexcel-0.0.18

- old
+ new
@@ -15,17 +15,17 @@
 number                          := /[-+]?[0-9]+\.?[0-9]*([eE][-+]?[0-9]+)?/
 operator                        := '+' | '-' | '/' | '*' | '^'
 external_reference              := /\[\d+\]!?/ any_internal_reference
 table_reference                 := table_name `'[' (range_structured_reference | complex_structured_reference | simple_structured_reference) `']'
 local_table_reference           := `'[' (range_structured_reference | complex_structured_reference | overly_structured_reference | simple_structured_reference) `']'
-table_name                       = /[.a-zA-Z0-9_]+/
+table_name                       = /[.\p{Word}]+/
 range_structured_reference       = /\[[^\u005d]*\],\[[^\u005d]*\]:\[[^\u005d]*\]/
 complex_structured_reference     = /\[[^\u005d]*\],\[[^\u005d]*\]/
 overly_structured_reference      = `'[' simple_structured_reference `']'
 simple_structured_reference      = /[^\u005d]*/
-named_reference                 := /[#a-zA-Z][\w_.!]+/
+named_reference                 := /[\p{Word}#][\p{Word}.!]*/
 quoted_sheet_reference          := single_quoted_string `'!' (sheetless_reference | named_reference)
-sheet_reference                 := /[a-zA-Z0-9][\w_.]+/ `'!' (sheetless_reference | named_reference)
+sheet_reference                 := /[\p{Word}][\p{Word}_.]+/ `'!' (sheetless_reference | named_reference)
 single_quoted_string             = `"'" /[^']*/ `"'"
 sheetless_reference              = column_range | row_range | area | cell
 column_range                    := column `':' column
 row_range                       := row `':' row
 area                            := reference `':' reference