ReadonlyBackslashWhether a backslash makes the next character literal.
ReadonlyDoubledWhether a doubled quote character inside the literal stands for one literal quote.
ReadonlyPrefixesThe prefixes that open this form, matched ignoring case. '' is the bare form (no prefix);
'N' is a national-character literal, 'E' a PostgreSQL escape string, 'R' a raw string.
ReadonlyQuoteThe quote character that opens and closes the literal.
One form of string literal: a quote character, the prefixes that may introduce it, and the escapes recognized inside it.