Here's the relevant part of the grammar I wrote a while back:
# contents must not contain unescaped quote character
strLit ::= quote ( hexEscape | octEscape | charEscape | /[^\0\n]/ )*
quote
quote ::= /["']/
hexEscape ::= /\\[Xx][A-Fa-f0-9]{1,2}/
octEscape ::= /\\0?[0-7]{1,3}/
charEscape ::= /\\[abfnrtv\\\?'"]/
Though it might have changed by now.
--
Alek Storm
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