quoted_string_parser() return parser_interface(unspecified);

template<parsable_range_like R, typename Parser = unspecified> 
  auto operator()(R && r, parser_interface< Parser > char_p = char_) const noexcept;

Returns a parser_interface containing a quoted_string_parser that accepts any of the values in r as its quotation marks. If the input being matched during the parse is a a sequence of char32_t, the elements of r are transcoded from their presumed encoding to UTF-32 during the comparison. Otherwise, the character begin matched is directly compared to the elements of r.

template<typename T, typename U, typename Parser = unspecified> 
  auto operator()(T x, symbols< U > const & escapes, 
                  parser_interface< Parser > char_p = char_) const noexcept;

Returns a parser_interface containing a quoted_string_parser that uses x as its quotation marks. symbols provides a list of strings that may appear after a backslash to form an escape sequence, and what character(s) each escape sequence represents. Note that "\\"</tt> and <tt>"\ch" are always valid escape sequences.

template<parsable_range_like R, typename T, typename Parser = unspecified> 
  auto operator()(R && r, symbols< T > const & escapes, 
                  parser_interface< Parser > char_p = char_) const noexcept;

Returns a parser_interface containing a quoted_string_parser that accepts any of the values in r as its quotation marks. If the input being matched during the parse is a a sequence of char32_t, the elements of r are transcoded from their presumed encoding to UTF-32 during the comparison. Otherwise, the character begin matched is directly compared to the elements of r. symbols provides a list of strings that may appear after a backslash to form an escape sequence, and what character(s) each escape sequence represents. Note that "\\"</tt> and <tt>"\ch" are always valid escape sequences.