Philip Warner wrote:
While trying to understand dollar-quoting, I found the following in psql:
select $a$ hello $a$;
behaves as expected, but psql does not like
select $a$ \ $a$; or select $a$ \\ $a$;
Should it? How should a dollar-quote handle:
$a$ \$a\$a $a$
?
andrew=# select $a$ \ $a$; ?column? ---------- \ (1 row)
andrew=# select $a$ \\ $a$; ?column? ---------- \\ (1 row)
It is behaving as *I* expect, and as designed. \ is not magical inside dollar quotes, and if it were it would defeat the whole purpose of having them.
Dollar quotes are really designed for strings that are reparsed - most typically function bodies. The strings inside them are therefore totally opaque, and there is no escape character. Otherwise, if we wanted the plpgsql parsers, say, to see \ we'd have to write \\, and the idea was to get away from \\, \', '' and friends.
cheers
andrew
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