Fixed string constants and queries splitting.

[alxivnov]

\ at the end of string constants breaks string/query splitting. Here is the test:

-- \ at the end of strting query splitting
SELECT 'some''', '\', ';';

SELECT E'some\'', E'\\', E';';

SELECT 'some''', '\', ';', E'some\'', E'\\', E';';

SELECT E'some\'', E'\\', E';', 'some''', '\', ';';

[peterpp]

Thanks for sharing, but your fix contains several problems:

• C-style escapes depends on SQL dialect and server settings.
• String constants letter E is PostgreSQL specific and is case-insensitive.
• Added "[^']" rule works only for single quotes, but main cycle detects various types of string quotes.

Here you can find a solution for MySQL and PostgreSQL based on your work (if you are interested): pematon@aa519b7