Method lowercase

include/reflex/pattern.h:1416–1419

convert to lower case if c is a letter a-z, A-Z.

  }
  /// convert to lower case if c is a letter a-z, A-Z.
  static inline Char lowercase(Char c)
  {
    return static_cast<unsigned char>(c | 0x20);
  }
  /// convert to upper case if c is a letter a-z, A-Z.
  static inline Char uppercase(Char c)
  {